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Simplifying 42 = 3x + -12 Reorder the terms: 42 = -12 + 3x Solving 42 = -12 + 3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3x' to each side of the equation. 42 + -3x = -12 + 3x + -3x Combine like terms: 3x + -3x = 0 42 + -3x = -12 + 0 42 + -3x = -12 Add '-42' to each side of the equation. 42 + -42 + -3x = -12 + -42 Combine like terms: 42 + -42 = 0 0 + -3x = -12 + -42 -3x = -12 + -42 Combine like terms: -12 + -42 = -54 -3x = -54 Divide each side by '-3'. x = 18 Simplifying x = 18
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