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Simplifying 7 = 8r + 7r Combine like terms: 8r + 7r = 15r 7 = 15r Solving 7 = 15r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-15r' to each side of the equation. 7 + -15r = 15r + -15r Combine like terms: 15r + -15r = 0 7 + -15r = 0 Add '-7' to each side of the equation. 7 + -7 + -15r = 0 + -7 Combine like terms: 7 + -7 = 0 0 + -15r = 0 + -7 -15r = 0 + -7 Combine like terms: 0 + -7 = -7 -15r = -7 Divide each side by '-15'. r = 0.4666666667 Simplifying r = 0.4666666667
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