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Simplifying 7 + -9r + 5r + -8 = 0 Reorder the terms: 7 + -8 + -9r + 5r = 0 Combine like terms: 7 + -8 = -1 -1 + -9r + 5r = 0 Combine like terms: -9r + 5r = -4r -1 + -4r = 0 Solving -1 + -4r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + -4r = 0 + 1 Combine like terms: -1 + 1 = 0 0 + -4r = 0 + 1 -4r = 0 + 1 Combine like terms: 0 + 1 = 1 -4r = 1 Divide each side by '-4'. r = -0.25 Simplifying r = -0.25
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