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Simplifying -9r = 20 + -1r Solving -9r = 20 + -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. -9r + r = 20 + -1r + r Combine like terms: -9r + r = -8r -8r = 20 + -1r + r Combine like terms: -1r + r = 0 -8r = 20 + 0 -8r = 20 Divide each side by '-8'. r = -2.5 Simplifying r = -2.5
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