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Simplifying -3 + 8r = 9r Solving -3 + 8r = 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. -3 + 8r + -9r = 9r + -9r Combine like terms: 8r + -9r = -1r -3 + -1r = 9r + -9r Combine like terms: 9r + -9r = 0 -3 + -1r = 0 Add '3' to each side of the equation. -3 + 3 + -1r = 0 + 3 Combine like terms: -3 + 3 = 0 0 + -1r = 0 + 3 -1r = 0 + 3 Combine like terms: 0 + 3 = 3 -1r = 3 Divide each side by '-1'. r = -3 Simplifying r = -3
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