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Simplifying 7r + -8 + -9r = -17 Reorder the terms: -8 + 7r + -9r = -17 Combine like terms: 7r + -9r = -2r -8 + -2r = -17 Solving -8 + -2r = -17 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '8' to each side of the equation. -8 + 8 + -2r = -17 + 8 Combine like terms: -8 + 8 = 0 0 + -2r = -17 + 8 -2r = -17 + 8 Combine like terms: -17 + 8 = -9 -2r = -9 Divide each side by '-2'. r = 4.5 Simplifying r = 4.5
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