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