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Simplifying -9r + 7 = 3 + -8r + 8 Reorder the terms: 7 + -9r = 3 + -8r + 8 Reorder the terms: 7 + -9r = 3 + 8 + -8r Combine like terms: 3 + 8 = 11 7 + -9r = 11 + -8r Solving 7 + -9r = 11 + -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. 7 + -9r + 8r = 11 + -8r + 8r Combine like terms: -9r + 8r = -1r 7 + -1r = 11 + -8r + 8r Combine like terms: -8r + 8r = 0 7 + -1r = 11 + 0 7 + -1r = 11 Add '-7' to each side of the equation. 7 + -7 + -1r = 11 + -7 Combine like terms: 7 + -7 = 0 0 + -1r = 11 + -7 -1r = 11 + -7 Combine like terms: 11 + -7 = 4 -1r = 4 Divide each side by '-1'. r = -4 Simplifying r = -4
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