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Simplifying (3x + 7y) + 2y = 3x + (7y + 2y) Remove parenthesis around (3x + 7y) 3x + 7y + 2y = 3x + (7y + 2y) Combine like terms: 7y + 2y = 9y 3x + 9y = 3x + (7y + 2y) Combine like terms: 7y + 2y = 9y 3x + 9y = 3x + (9y) 3x + 9y = 3x + (9y) Add '-3x' to each side of the equation. 3x + -3x + 9y = 3x + -3x + (9y) Combine like terms: 3x + -3x = 0 0 + 9y = 3x + -3x + (9y) 9y = 3x + -3x + (9y) Combine like terms: 3x + -3x = 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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