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Simplifying -3x + 5(-4x + -7) = 126 Reorder the terms: -3x + 5(-7 + -4x) = 126 -3x + (-7 * 5 + -4x * 5) = 126 -3x + (-35 + -20x) = 126 Reorder the terms: -35 + -3x + -20x = 126 Combine like terms: -3x + -20x = -23x -35 + -23x = 126 Solving -35 + -23x = 126 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '35' to each side of the equation. -35 + 35 + -23x = 126 + 35 Combine like terms: -35 + 35 = 0 0 + -23x = 126 + 35 -23x = 126 + 35 Combine like terms: 126 + 35 = 161 -23x = 161 Divide each side by '-23'. x = -7 Simplifying x = -7
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