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