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