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Simplifying 9r + -91 = -7 + 8r Reorder the terms: -91 + 9r = -7 + 8r Solving -91 + 9r = -7 + 8r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-8r' to each side of the equation. -91 + 9r + -8r = -7 + 8r + -8r Combine like terms: 9r + -8r = 1r -91 + 1r = -7 + 8r + -8r Combine like terms: 8r + -8r = 0 -91 + 1r = -7 + 0 -91 + 1r = -7 Add '91' to each side of the equation. -91 + 91 + 1r = -7 + 91 Combine like terms: -91 + 91 = 0 0 + 1r = -7 + 91 1r = -7 + 91 Combine like terms: -7 + 91 = 84 1r = 84 Divide each side by '1'. r = 84 Simplifying r = 84
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