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Simplifying 4x + 2(13 + -1x) = 42 4x + (13 * 2 + -1x * 2) = 42 4x + (26 + -2x) = 42 Reorder the terms: 26 + 4x + -2x = 42 Combine like terms: 4x + -2x = 2x 26 + 2x = 42 Solving 26 + 2x = 42 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-26' to each side of the equation. 26 + -26 + 2x = 42 + -26 Combine like terms: 26 + -26 = 0 0 + 2x = 42 + -26 2x = 42 + -26 Combine like terms: 42 + -26 = 16 2x = 16 Divide each side by '2'. x = 8 Simplifying x = 8
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