9 divided by the sum of x and 4 is equal to 6 divided by x minus 4. Build our two algebraic expressions first: 9 divided by the sum of x and 4 9/(x + 4) 6 divided by x minus 4 6/(x - 4) The phrase is equal to means and equation, so we set the algebraic expressions equal to each other: 9/(x + 4) = 6/(x - 4) <-- This is our algebraic expression If the problem asks you to solve for x, we cross multiply: 9(x - 4) = 6(x + 4) To solve for x, we type this equation into our search engine and we get: x = 20
