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Simplifying -5x + 7(3x + 20) = -66 Reorder the terms: -5x + 7(20 + 3x) = -66 -5x + (20 * 7 + 3x * 7) = -66 -5x + (140 + 21x) = -66 Reorder the terms: 140 + -5x + 21x = -66 Combine like terms: -5x + 21x = 16x 140 + 16x = -66 Solving 140 + 16x = -66 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-140' to each side of the equation. 140 + -140 + 16x = -66 + -140 Combine like terms: 140 + -140 = 0 0 + 16x = -66 + -140 16x = -66 + -140 Combine like terms: -66 + -140 = -206 16x = -206 Divide each side by '16'. x = -12.875 Simplifying x = -12.875
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