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Simplifying 42 = 3x + -9 Reorder the terms: 42 = -9 + 3x Solving 42 = -9 + 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 = -9 + 3x + -3x Combine like terms: 3x + -3x = 0 42 + -3x = -9 + 0 42 + -3x = -9 Add '-42' to each side of the equation. 42 + -42 + -3x = -9 + -42 Combine like terms: 42 + -42 = 0 0 + -3x = -9 + -42 -3x = -9 + -42 Combine like terms: -9 + -42 = -51 -3x = -51 Divide each side by '-3'. x = 17 Simplifying x = 17
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