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Simplifying 7x + 12 + -5x = 42 Reorder the terms: 12 + 7x + -5x = 42 Combine like terms: 7x + -5x = 2x 12 + 2x = 42 Solving 12 + 2x = 42 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + -12 + 2x = 42 + -12 Combine like terms: 12 + -12 = 0 0 + 2x = 42 + -12 2x = 42 + -12 Combine like terms: 42 + -12 = 30 2x = 30 Divide each side by '2'. x = 15 Simplifying x = 15
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