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Simplifying 86 = 66 + r Solving 86 = 66 + 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. 86 + -1r = 66 + r + -1r Combine like terms: r + -1r = 0 86 + -1r = 66 + 0 86 + -1r = 66 Add '-86' to each side of the equation. 86 + -86 + -1r = 66 + -86 Combine like terms: 86 + -86 = 0 0 + -1r = 66 + -86 -1r = 66 + -86 Combine like terms: 66 + -86 = -20 -1r = -20 Divide each side by '-1'. r = 20 Simplifying r = 20
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