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Simplifying -10 = -1(r + -9) Reorder the terms: -10 = -1(-9 + r) -10 = (-9 * -1 + r * -1) -10 = (9 + -1r) Solving -10 = 9 + -1r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add 'r' to each side of the equation. -10 + r = 9 + -1r + r Combine like terms: -1r + r = 0 -10 + r = 9 + 0 -10 + r = 9 Add '10' to each side of the equation. -10 + 10 + r = 9 + 10 Combine like terms: -10 + 10 = 0 0 + r = 9 + 10 r = 9 + 10 Combine like terms: 9 + 10 = 19 r = 19 Simplifying r = 19
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