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Simplifying 9 + 3x = 39 + -12x Solving 9 + 3x = 39 + -12x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '12x' to each side of the equation. 9 + 3x + 12x = 39 + -12x + 12x Combine like terms: 3x + 12x = 15x 9 + 15x = 39 + -12x + 12x Combine like terms: -12x + 12x = 0 9 + 15x = 39 + 0 9 + 15x = 39 Add '-9' to each side of the equation. 9 + -9 + 15x = 39 + -9 Combine like terms: 9 + -9 = 0 0 + 15x = 39 + -9 15x = 39 + -9 Combine like terms: 39 + -9 = 30 15x = 30 Divide each side by '15'. x = 2 Simplifying x = 2
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