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Simplifying 31 = 7x + 3x + -9 Reorder the terms: 31 = -9 + 7x + 3x Combine like terms: 7x + 3x = 10x 31 = -9 + 10x Solving 31 = -9 + 10x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-10x' to each side of the equation. 31 + -10x = -9 + 10x + -10x Combine like terms: 10x + -10x = 0 31 + -10x = -9 + 0 31 + -10x = -9 Add '-31' to each side of the equation. 31 + -31 + -10x = -9 + -31 Combine like terms: 31 + -31 = 0 0 + -10x = -9 + -31 -10x = -9 + -31 Combine like terms: -9 + -31 = -40 -10x = -40 Divide each side by '-10'. x = 4 Simplifying x = 4
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