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Simplifying 9 + -8r = 4 + -7r Solving 9 + -8r = 4 + -7r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '7r' to each side of the equation. 9 + -8r + 7r = 4 + -7r + 7r Combine like terms: -8r + 7r = -1r 9 + -1r = 4 + -7r + 7r Combine like terms: -7r + 7r = 0 9 + -1r = 4 + 0 9 + -1r = 4 Add '-9' to each side of the equation. 9 + -9 + -1r = 4 + -9 Combine like terms: 9 + -9 = 0 0 + -1r = 4 + -9 -1r = 4 + -9 Combine like terms: 4 + -9 = -5 -1r = -5 Divide each side by '-1'. r = 5 Simplifying r = 5
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