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Simplifying 12 = 9x + 3x + 31 Reorder the terms: 12 = 31 + 9x + 3x Combine like terms: 9x + 3x = 12x 12 = 31 + 12x Solving 12 = 31 + 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. 12 + -12x = 31 + 12x + -12x Combine like terms: 12x + -12x = 0 12 + -12x = 31 + 0 12 + -12x = 31 Add '-12' to each side of the equation. 12 + -12 + -12x = 31 + -12 Combine like terms: 12 + -12 = 0 0 + -12x = 31 + -12 -12x = 31 + -12 Combine like terms: 31 + -12 = 19 -12x = 19 Divide each side by '-12'. x = -1.583333333 Simplifying x = -1.583333333
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