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Simplifying 20 = r + 7 Reorder the terms: 20 = 7 + r Solving 20 = 7 + r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-1r' to each side of the equation. 20 + -1r = 7 + r + -1r Combine like terms: r + -1r = 0 20 + -1r = 7 + 0 20 + -1r = 7 Add '-20' to each side of the equation. 20 + -20 + -1r = 7 + -20 Combine like terms: 20 + -20 = 0 0 + -1r = 7 + -20 -1r = 7 + -20 Combine like terms: 7 + -20 = -13 -1r = -13 Divide each side by '-1'. r = 13 Simplifying r = 13
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