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Simplifying 9 = 2y + -1(2y + -9) Reorder the terms: 9 = 2y + -1(-9 + 2y) 9 = 2y + (-9 * -1 + 2y * -1) 9 = 2y + (9 + -2y) Reorder the terms: 9 = 9 + 2y + -2y Combine like terms: 2y + -2y = 0 9 = 9 + 0 9 = 9 Add '-9' to each side of the equation. 9 + -9 = 9 + -9 Combine like terms: 9 + -9 = 0 0 = 9 + -9 Combine like terms: 9 + -9 = 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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