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Simplifying 31 = x + 2x + 7 Reorder the terms: 31 = 7 + x + 2x Combine like terms: x + 2x = 3x 31 = 7 + 3x Solving 31 = 7 + 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. 31 + -3x = 7 + 3x + -3x Combine like terms: 3x + -3x = 0 31 + -3x = 7 + 0 31 + -3x = 7 Add '-31' to each side of the equation. 31 + -31 + -3x = 7 + -31 Combine like terms: 31 + -31 = 0 0 + -3x = 7 + -31 -3x = 7 + -31 Combine like terms: 7 + -31 = -24 -3x = -24 Divide each side by '-3'. x = 8 Simplifying x = 8
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