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