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Simplifying 2r + -7r + r + -9 = 0 Reorder the terms: -9 + 2r + -7r + r = 0 Combine like terms: 2r + -7r = -5r -9 + -5r + r = 0 Combine like terms: -5r + r = -4r -9 + -4r = 0 Solving -9 + -4r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + -4r = 0 + 9 Combine like terms: -9 + 9 = 0 0 + -4r = 0 + 9 -4r = 0 + 9 Combine like terms: 0 + 9 = 9 -4r = 9 Divide each side by '-4'. r = -2.25 Simplifying r = -2.25
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