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Simplifying 20 + -1x + -3(2x + 1) = 12 Reorder the terms: 20 + -1x + -3(1 + 2x) = 12 20 + -1x + (1 * -3 + 2x * -3) = 12 20 + -1x + (-3 + -6x) = 12 Reorder the terms: 20 + -3 + -1x + -6x = 12 Combine like terms: 20 + -3 = 17 17 + -1x + -6x = 12 Combine like terms: -1x + -6x = -7x 17 + -7x = 12 Solving 17 + -7x = 12 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-17' to each side of the equation. 17 + -17 + -7x = 12 + -17 Combine like terms: 17 + -17 = 0 0 + -7x = 12 + -17 -7x = 12 + -17 Combine like terms: 12 + -17 = -5 -7x = -5 Divide each side by '-7'. x = 0.7142857143 Simplifying x = 0.7142857143
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