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Simplifying 81x + -2(x + -1) = 90 Reorder the terms: 81x + -2(-1 + x) = 90 81x + (-1 * -2 + x * -2) = 90 81x + (2 + -2x) = 90 Reorder the terms: 2 + 81x + -2x = 90 Combine like terms: 81x + -2x = 79x 2 + 79x = 90 Solving 2 + 79x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + 79x = 90 + -2 Combine like terms: 2 + -2 = 0 0 + 79x = 90 + -2 79x = 90 + -2 Combine like terms: 90 + -2 = 88 79x = 88 Divide each side by '79'. x = 1.113924051 Simplifying x = 1.113924051
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