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Simplifying 7(7 + -1r) = 12 (7 * 7 + -1r * 7) = 12 (49 + -7r) = 12 Solving 49 + -7r = 12 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-49' to each side of the equation. 49 + -49 + -7r = 12 + -49 Combine like terms: 49 + -49 = 0 0 + -7r = 12 + -49 -7r = 12 + -49 Combine like terms: 12 + -49 = -37 -7r = -37 Divide each side by '-7'. r = 5.285714286 Simplifying r = 5.285714286
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