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Simplifying 18x + -1(7x + -9) = 86 Reorder the terms: 18x + -1(-9 + 7x) = 86 18x + (-9 * -1 + 7x * -1) = 86 18x + (9 + -7x) = 86 Reorder the terms: 9 + 18x + -7x = 86 Combine like terms: 18x + -7x = 11x 9 + 11x = 86 Solving 9 + 11x = 86 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + 11x = 86 + -9 Combine like terms: 9 + -9 = 0 0 + 11x = 86 + -9 11x = 86 + -9 Combine like terms: 86 + -9 = 77 11x = 77 Divide each side by '11'. x = 7 Simplifying x = 7
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