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Simplifying 3x + 4(42 + -1x) = 42 3x + (42 * 4 + -1x * 4) = 42 3x + (168 + -4x) = 42 Reorder the terms: 168 + 3x + -4x = 42 Combine like terms: 3x + -4x = -1x 168 + -1x = 42 Solving 168 + -1x = 42 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-168' to each side of the equation. 168 + -168 + -1x = 42 + -168 Combine like terms: 168 + -168 = 0 0 + -1x = 42 + -168 -1x = 42 + -168 Combine like terms: 42 + -168 = -126 -1x = -126 Divide each side by '-1'. x = 126 Simplifying x = 126
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