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Simplifying 90 + -1(2x + 9) = 20 Reorder the terms: 90 + -1(9 + 2x) = 20 90 + (9 * -1 + 2x * -1) = 20 90 + (-9 + -2x) = 20 Combine like terms: 90 + -9 = 81 81 + -2x = 20 Solving 81 + -2x = 20 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-81' to each side of the equation. 81 + -81 + -2x = 20 + -81 Combine like terms: 81 + -81 = 0 0 + -2x = 20 + -81 -2x = 20 + -81 Combine like terms: 20 + -81 = -61 -2x = -61 Divide each side by '-2'. x = 30.5 Simplifying x = 30.5
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