# a+20=3a

## Enter Equation or Inequality

Solve the following equation
a+20=3a

Solve for a
a + 20 = 3a

## Group variables

Group our variables a and 3a
subtract 3a from both sides
a + 20 - 3a = 3a - 3a

-2a + 20 = 0

## Group constants

Group our constants 20 and 0.
subtract 20 from both sides
-2a + 20 - 20 = 0 - 20

-2a = -20

## Divide each side of the equation by -2

 -2a -2
 =
 -20 -2

a = 10

a = 10

### 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?

1. One Step Equations (Division): cx = b x = b/c
2. One Step Equations (Addition): x + c = b x = b - c
3. 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