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Simplifying (-3x + 7) + -1(2x + -8) = 90 Reorder the terms: (7 + -3x) + -1(2x + -8) = 90 Remove parenthesis around (7 + -3x) 7 + -3x + -1(2x + -8) = 90 Reorder the terms: 7 + -3x + -1(-8 + 2x) = 90 7 + -3x + (-8 * -1 + 2x * -1) = 90 7 + -3x + (8 + -2x) = 90 Reorder the terms: 7 + 8 + -3x + -2x = 90 Combine like terms: 7 + 8 = 15 15 + -3x + -2x = 90 Combine like terms: -3x + -2x = -5x 15 + -5x = 90 Solving 15 + -5x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-15' to each side of the equation. 15 + -15 + -5x = 90 + -15 Combine like terms: 15 + -15 = 0 0 + -5x = 90 + -15 -5x = 90 + -15 Combine like terms: 90 + -15 = 75 -5x = 75 Divide each side by '-5'. x = -15 Simplifying x = -15
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