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Simplifying 140 = 9(9 + -1x) + -4 140 = (9 * 9 + -1x * 9) + -4 140 = (81 + -9x) + -4 Reorder the terms: 140 = 81 + -4 + -9x Combine like terms: 81 + -4 = 77 140 = 77 + -9x Solving 140 = 77 + -9x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9x' to each side of the equation. 140 + 9x = 77 + -9x + 9x Combine like terms: -9x + 9x = 0 140 + 9x = 77 + 0 140 + 9x = 77 Add '-140' to each side of the equation. 140 + -140 + 9x = 77 + -140 Combine like terms: 140 + -140 = 0 0 + 9x = 77 + -140 9x = 77 + -140 Combine like terms: 77 + -140 = -63 9x = -63 Divide each side by '9'. x = -7 Simplifying x = -7
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