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Simplifying 81x + -1(2x + -1) = 90 Reorder the terms: 81x + -1(-1 + 2x) = 90 81x + (-1 * -1 + 2x * -1) = 90 81x + (1 + -2x) = 90 Reorder the terms: 1 + 81x + -2x = 90 Combine like terms: 81x + -2x = 79x 1 + 79x = 90 Solving 1 + 79x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + 79x = 90 + -1 Combine like terms: 1 + -1 = 0 0 + 79x = 90 + -1 79x = 90 + -1 Combine like terms: 90 + -1 = 89 79x = 89 Divide each side by '79'. x = 1.126582278 Simplifying x = 1.126582278
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