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Simplifying 1r = 8(r + -9) Reorder the terms: 1r = 8(-9 + r) 1r = (-9 * 8 + r * 8) 1r = (-72 + 8r) Solving 1r = -72 + 8r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-8r' to each side of the equation. 1r + -8r = -72 + 8r + -8r Combine like terms: 1r + -8r = -7r -7r = -72 + 8r + -8r Combine like terms: 8r + -8r = 0 -7r = -72 + 0 -7r = -72 Divide each side by '-7'. r = 10.28571429 Simplifying r = 10.28571429
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