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Simplifying -9 = -10 + -1r Solving -9 = -10 + -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. -9 + r = -10 + -1r + r Combine like terms: -1r + r = 0 -9 + r = -10 + 0 -9 + r = -10 Add '9' to each side of the equation. -9 + 9 + r = -10 + 9 Combine like terms: -9 + 9 = 0 0 + r = -10 + 9 r = -10 + 9 Combine like terms: -10 + 9 = -1 r = -1 Simplifying r = -1
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