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Simplifying 9 = 5r + 7 Reorder the terms: 9 = 7 + 5r Solving 9 = 7 + 5r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-5r' to each side of the equation. 9 + -5r = 7 + 5r + -5r Combine like terms: 5r + -5r = 0 9 + -5r = 7 + 0 9 + -5r = 7 Add '-9' to each side of the equation. 9 + -9 + -5r = 7 + -9 Combine like terms: 9 + -9 = 0 0 + -5r = 7 + -9 -5r = 7 + -9 Combine like terms: 7 + -9 = -2 -5r = -2 Divide each side by '-5'. r = 0.4 Simplifying r = 0.4
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