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Simplifying 31 = x + 20 Reorder the terms: 31 = 20 + x Solving 31 = 20 + x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1x' to each side of the equation. 31 + -1x = 20 + x + -1x Combine like terms: x + -1x = 0 31 + -1x = 20 + 0 31 + -1x = 20 Add '-31' to each side of the equation. 31 + -31 + -1x = 20 + -31 Combine like terms: 31 + -31 = 0 0 + -1x = 20 + -31 -1x = 20 + -31 Combine like terms: 20 + -31 = -11 -1x = -11 Divide each side by '-1'. x = 11 Simplifying x = 11
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