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Simplifying 3x + 4 + -1x = 42 Reorder the terms: 4 + 3x + -1x = 42 Combine like terms: 3x + -1x = 2x 4 + 2x = 42 Solving 4 + 2x = 42 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + 2x = 42 + -4 Combine like terms: 4 + -4 = 0 0 + 2x = 42 + -4 2x = 42 + -4 Combine like terms: 42 + -4 = 38 2x = 38 Divide each side by '2'. x = 19 Simplifying x = 19
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