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Simplifying -1r = 8(1r + -9) Reorder the terms: -1r = 8(-9 + 1r) -1r = (-9 * 8 + 1r * 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 = -9r -9r = -72 + 8r + -8r Combine like terms: 8r + -8r = 0 -9r = -72 + 0 -9r = -72 Divide each side by '-9'. r = 8 Simplifying r = 8
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