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Simplifying 2(2x + -9) = 4x + -18 Reorder the terms: 2(-9 + 2x) = 4x + -18 (-9 * 2 + 2x * 2) = 4x + -18 (-18 + 4x) = 4x + -18 Reorder the terms: -18 + 4x = -18 + 4x Add '18' to each side of the equation. -18 + 18 + 4x = -18 + 18 + 4x Combine like terms: -18 + 18 = 0 0 + 4x = -18 + 18 + 4x 4x = -18 + 18 + 4x Combine like terms: -18 + 18 = 0 4x = 0 + 4x 4x = 4x Add '-4x' to each side of the equation. 4x + -4x = 4x + -4x Combine like terms: 4x + -4x = 0 0 = 4x + -4x Combine like terms: 4x + -4x = 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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