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Simplifying -1(5 + -4x) = 2(4x + -7) + -4x + 9 (5 * -1 + -4x * -1) = 2(4x + -7) + -4x + 9 (-5 + 4x) = 2(4x + -7) + -4x + 9 Reorder the terms: -5 + 4x = 2(-7 + 4x) + -4x + 9 -5 + 4x = (-7 * 2 + 4x * 2) + -4x + 9 -5 + 4x = (-14 + 8x) + -4x + 9 Reorder the terms: -5 + 4x = -14 + 9 + 8x + -4x Combine like terms: -14 + 9 = -5 -5 + 4x = -5 + 8x + -4x Combine like terms: 8x + -4x = 4x -5 + 4x = -5 + 4x Add '5' to each side of the equation. -5 + 5 + 4x = -5 + 5 + 4x Combine like terms: -5 + 5 = 0 0 + 4x = -5 + 5 + 4x 4x = -5 + 5 + 4x Combine like terms: -5 + 5 = 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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