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Simplifying 3 + x = (3x + -9) Reorder the terms: 3 + x = (-9 + 3x) Remove parenthesis around (-9 + 3x) 3 + x = -9 + 3x Solving 3 + x = -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. 3 + x + -3x = -9 + 3x + -3x Combine like terms: x + -3x = -2x 3 + -2x = -9 + 3x + -3x Combine like terms: 3x + -3x = 0 3 + -2x = -9 + 0 3 + -2x = -9 Add '-3' to each side of the equation. 3 + -3 + -2x = -9 + -3 Combine like terms: 3 + -3 = 0 0 + -2x = -9 + -3 -2x = -9 + -3 Combine like terms: -9 + -3 = -12 -2x = -12 Divide each side by '-2'. x = 6 Simplifying x = 6
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