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Simplifying -5 + -8r = -7r + -2r Combine like terms: -7r + -2r = -9r -5 + -8r = -9r Solving -5 + -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. -5 + -8r + 9r = -9r + 9r Combine like terms: -8r + 9r = 1r -5 + 1r = -9r + 9r Combine like terms: -9r + 9r = 0 -5 + 1r = 0 Add '5' to each side of the equation. -5 + 5 + 1r = 0 + 5 Combine like terms: -5 + 5 = 0 0 + 1r = 0 + 5 1r = 0 + 5 Combine like terms: 0 + 5 = 5 1r = 5 Divide each side by '1'. r = 5 Simplifying r = 5
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