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Simplifying -2(2x + -9) + 1 = -4x + 19 Reorder the terms: -2(-9 + 2x) + 1 = -4x + 19 (-9 * -2 + 2x * -2) + 1 = -4x + 19 (18 + -4x) + 1 = -4x + 19 Reorder the terms: 18 + 1 + -4x = -4x + 19 Combine like terms: 18 + 1 = 19 19 + -4x = -4x + 19 Reorder the terms: 19 + -4x = 19 + -4x Add '-19' to each side of the equation. 19 + -19 + -4x = 19 + -19 + -4x Combine like terms: 19 + -19 = 0 0 + -4x = 19 + -19 + -4x -4x = 19 + -19 + -4x Combine like terms: 19 + -19 = 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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