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Simplifying -10 = 9r + 100 Reorder the terms: -10 = 100 + 9r Solving -10 = 100 + 9r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-9r' to each side of the equation. -10 + -9r = 100 + 9r + -9r Combine like terms: 9r + -9r = 0 -10 + -9r = 100 + 0 -10 + -9r = 100 Add '10' to each side of the equation. -10 + 10 + -9r = 100 + 10 Combine like terms: -10 + 10 = 0 0 + -9r = 100 + 10 -9r = 100 + 10 Combine like terms: 100 + 10 = 110 -9r = 110 Divide each side by '-9'. r = -12.22222222 Simplifying r = -12.22222222
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