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Simplifying 42 = -3x + 15 Reorder the terms: 42 = 15 + -3x Solving 42 = 15 + -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 = 15 + -3x + 3x Combine like terms: -3x + 3x = 0 42 + 3x = 15 + 0 42 + 3x = 15 Add '-42' to each side of the equation. 42 + -42 + 3x = 15 + -42 Combine like terms: 42 + -42 = 0 0 + 3x = 15 + -42 3x = 15 + -42 Combine like terms: 15 + -42 = -27 3x = -27 Divide each side by '3'. x = -9 Simplifying x = -9
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