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Simplifying 8 + -10r = 15 + -9r Solving 8 + -10r = 15 + -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. 8 + -10r + 9r = 15 + -9r + 9r Combine like terms: -10r + 9r = -1r 8 + -1r = 15 + -9r + 9r Combine like terms: -9r + 9r = 0 8 + -1r = 15 + 0 8 + -1r = 15 Add '-8' to each side of the equation. 8 + -8 + -1r = 15 + -8 Combine like terms: 8 + -8 = 0 0 + -1r = 15 + -8 -1r = 15 + -8 Combine like terms: 15 + -8 = 7 -1r = 7 Divide each side by '-1'. r = -7 Simplifying r = -7
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