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Simplifying 81x = 9(140 + -1x) 81x = (140 * 9 + -1x * 9) 81x = (1260 + -9x) Solving 81x = 1260 + -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. 81x + 9x = 1260 + -9x + 9x Combine like terms: 81x + 9x = 90x 90x = 1260 + -9x + 9x Combine like terms: -9x + 9x = 0 90x = 1260 + 0 90x = 1260 Divide each side by '90'. x = 14 Simplifying x = 14
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