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Simplifying 9(x + y) = 9x + 9y (x * 9 + y * 9) = 9x + 9y (9x + 9y) = 9x + 9y Add '-9x' to each side of the equation. 9x + -9x + 9y = 9x + -9x + 9y Combine like terms: 9x + -9x = 0 0 + 9y = 9x + -9x + 9y 9y = 9x + -9x + 9y Combine like terms: 9x + -9x = 0 9y = 0 + 9y 9y = 9y Add '-9y' to each side of the equation. 9y + -9y = 9y + -9y Combine like terms: 9y + -9y = 0 0 = 9y + -9y Combine like terms: 9y + -9y = 0 0 = 0 Solving 0 = 0 Couldn't find a variable to solve for. This equation is an identity, all real numbers are solutions.
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