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Simplifying 20 = x + 31 Reorder the terms: 20 = 31 + x Solving 20 = 31 + 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. 20 + -1x = 31 + x + -1x Combine like terms: x + -1x = 0 20 + -1x = 31 + 0 20 + -1x = 31 Add '-20' to each side of the equation. 20 + -20 + -1x = 31 + -20 Combine like terms: 20 + -20 = 0 0 + -1x = 31 + -20 -1x = 31 + -20 Combine like terms: 31 + -20 = 11 -1x = 11 Divide each side by '-1'. x = -11 Simplifying x = -11
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