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Simplifying 9 + -9x = 31x + 21 Reorder the terms: 9 + -9x = 21 + 31x Solving 9 + -9x = 21 + 31x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-31x' to each side of the equation. 9 + -9x + -31x = 21 + 31x + -31x Combine like terms: -9x + -31x = -40x 9 + -40x = 21 + 31x + -31x Combine like terms: 31x + -31x = 0 9 + -40x = 21 + 0 9 + -40x = 21 Add '-9' to each side of the equation. 9 + -9 + -40x = 21 + -9 Combine like terms: 9 + -9 = 0 0 + -40x = 21 + -9 -40x = 21 + -9 Combine like terms: 21 + -9 = 12 -40x = 12 Divide each side by '-40'. x = -0.3 Simplifying x = -0.3
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