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Simplifying -2(-1x + 9) = 2(x + -9) Reorder the terms: -2(9 + -1x) = 2(x + -9) (9 * -2 + -1x * -2) = 2(x + -9) (-18 + 2x) = 2(x + -9) Reorder the terms: -18 + 2x = 2(-9 + x) -18 + 2x = (-9 * 2 + x * 2) -18 + 2x = (-18 + 2x) Add '18' to each side of the equation. -18 + 18 + 2x = -18 + 18 + 2x Combine like terms: -18 + 18 = 0 0 + 2x = -18 + 18 + 2x 2x = -18 + 18 + 2x Combine like terms: -18 + 18 = 0 2x = 0 + 2x 2x = 2x Add '-2x' to each side of the equation. 2x + -2x = 2x + -2x Combine like terms: 2x + -2x = 0 0 = 2x + -2x Combine like terms: 2x + -2x = 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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