##### Enter Equation or Inequality

Solve the following equation

15u+640=55u

Solve for u

15u + 640 = 55u

##### Group variables

Group our variables 15u and 55u
subtract 55u from both sides

15u + 640 - 55u = 55u - 55u

-40u + 640 = 0

##### Group constants

Group our constants 640 and 0.
subtract 640 from both sides

-40u + 640 - 640 = 0 - 640

-40u = -640

##### Divide each side of the equation by -40

 -40u -40
 =
 -640 -40

u = 16

u = 16

#### You have 2 free calculationss remaining

u = 16
##### How does the Equation and Inequalities Calculator work?
Free Equation and Inequalities Calculator - Solves an equation or inequality with 1 unknown variable and no exponents as well as certain absolute value equations and inequalities such as |x|=c and |ax| = c where a and c are constants. Solves square root, cube root, and other root equations in the form ax^2=c, ax^2 + b = c. Also solves radical equations in the form asqrt(bx) = c. Also solves open sentences and it will solve one step problems and two step equations. 2 step equations and one step equations and multi step equations
This calculator has 1 input.

### What 3 formulas are used for the Equation and Inequalities Calculator?

One Step Equations (Division): cx = b x = b/c
One Step Equations (Addition): x + c = b x = b - c
One Step Equations (Subtraction): x - c = b x = b + c

For more math formulas, check out our Formula Dossier

### What 4 concepts are covered in the Equation and Inequalities Calculator?

equation
a statement declaring two mathematical expressions are equal
equation and inequalities
unknown
a number or value we do not know
variable
Alphabetic character representing a number