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Simplifying (20 + -1x) * 7 = 91 Reorder the terms for easier multiplication: 7(20 + -1x) = 91 (20 * 7 + -1x * 7) = 91 (140 + -7x) = 91 Solving 140 + -7x = 91 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 + -7x = 91 + -140 Combine like terms: 140 + -140 = 0 0 + -7x = 91 + -140 -7x = 91 + -140 Combine like terms: 91 + -140 = -49 -7x = -49 Divide each side by '-7'. x = 7 Simplifying x = 7
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