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Simplifying 20x + 9 = 12x + -31 Reorder the terms: 9 + 20x = 12x + -31 Reorder the terms: 9 + 20x = -31 + 12x Solving 9 + 20x = -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. 9 + 20x + -12x = -31 + 12x + -12x Combine like terms: 20x + -12x = 8x 9 + 8x = -31 + 12x + -12x Combine like terms: 12x + -12x = 0 9 + 8x = -31 + 0 9 + 8x = -31 Add '-9' to each side of the equation. 9 + -9 + 8x = -31 + -9 Combine like terms: 9 + -9 = 0 0 + 8x = -31 + -9 8x = -31 + -9 Combine like terms: -31 + -9 = -40 8x = -40 Divide each side by '8'. x = -5 Simplifying x = -5
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