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Simplifying 3x + -12 = 42 + -3x Reorder the terms: -12 + 3x = 42 + -3x Solving -12 + 3x = 42 + -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. -12 + 3x + 3x = 42 + -3x + 3x Combine like terms: 3x + 3x = 6x -12 + 6x = 42 + -3x + 3x Combine like terms: -3x + 3x = 0 -12 + 6x = 42 + 0 -12 + 6x = 42 Add '12' to each side of the equation. -12 + 12 + 6x = 42 + 12 Combine like terms: -12 + 12 = 0 0 + 6x = 42 + 12 6x = 42 + 12 Combine like terms: 42 + 12 = 54 6x = 54 Divide each side by '6'. x = 9 Simplifying x = 9
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