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Simplifying -8r + -1r = -12 + -7r Combine like terms: -8r + -1r = -9r -9r = -12 + -7r Solving -9r = -12 + -7r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '7r' to each side of the equation. -9r + 7r = -12 + -7r + 7r Combine like terms: -9r + 7r = -2r -2r = -12 + -7r + 7r Combine like terms: -7r + 7r = 0 -2r = -12 + 0 -2r = -12 Divide each side by '-2'. r = 6 Simplifying r = 6
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