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Simplifying 5x + -1(12 + -2x) + 20 = 81 5x + (12 * -1 + -2x * -1) + 20 = 81 5x + (-12 + 2x) + 20 = 81 Reorder the terms: -12 + 20 + 5x + 2x = 81 Combine like terms: -12 + 20 = 8 8 + 5x + 2x = 81 Combine like terms: 5x + 2x = 7x 8 + 7x = 81 Solving 8 + 7x = 81 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + 7x = 81 + -8 Combine like terms: 8 + -8 = 0 0 + 7x = 81 + -8 7x = 81 + -8 Combine like terms: 81 + -8 = 73 7x = 73 Divide each side by '7'. x = 10.42857143 Simplifying x = 10.42857143
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