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Simplifying 20(1 + -1x) + 13x = 42 (1 * 20 + -1x * 20) + 13x = 42 (20 + -20x) + 13x = 42 Combine like terms: -20x + 13x = -7x 20 + -7x = 42 Solving 20 + -7x = 42 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-20' to each side of the equation. 20 + -20 + -7x = 42 + -20 Combine like terms: 20 + -20 = 0 0 + -7x = 42 + -20 -7x = 42 + -20 Combine like terms: 42 + -20 = 22 -7x = 22 Divide each side by '-7'. x = -3.142857143 Simplifying x = -3.142857143
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