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Simplifying 15 = 7 + 3r Solving 15 = 7 + 3r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-3r' to each side of the equation. 15 + -3r = 7 + 3r + -3r Combine like terms: 3r + -3r = 0 15 + -3r = 7 + 0 15 + -3r = 7 Add '-15' to each side of the equation. 15 + -15 + -3r = 7 + -15 Combine like terms: 15 + -15 = 0 0 + -3r = 7 + -15 -3r = 7 + -15 Combine like terms: 7 + -15 = -8 -3r = -8 Divide each side by '-3'. r = 2.666666667 Simplifying r = 2.666666667
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