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Simplifying 20 = x + 13 Reorder the terms: 20 = 13 + x Solving 20 = 13 + 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 = 13 + x + -1x Combine like terms: x + -1x = 0 20 + -1x = 13 + 0 20 + -1x = 13 Add '-20' to each side of the equation. 20 + -20 + -1x = 13 + -20 Combine like terms: 20 + -20 = 0 0 + -1x = 13 + -20 -1x = 13 + -20 Combine like terms: 13 + -20 = -7 -1x = -7 Divide each side by '-1'. x = 7 Simplifying x = 7
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