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Simplifying x + 31 = 3x + 15 Reorder the terms: 31 + x = 3x + 15 Reorder the terms: 31 + x = 15 + 3x Solving 31 + x = 15 + 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 + x + -3x = 15 + 3x + -3x Combine like terms: x + -3x = -2x 31 + -2x = 15 + 3x + -3x Combine like terms: 3x + -3x = 0 31 + -2x = 15 + 0 31 + -2x = 15 Add '-31' to each side of the equation. 31 + -31 + -2x = 15 + -31 Combine like terms: 31 + -31 = 0 0 + -2x = 15 + -31 -2x = 15 + -31 Combine like terms: 15 + -31 = -16 -2x = -16 Divide each side by '-2'. x = 8 Simplifying x = 8
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