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Simplifying -4r + -9 = -7r Reorder the terms: -9 + -4r = -7r Solving -9 + -4r = -7r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '7r' to each side of the equation. -9 + -4r + 7r = -7r + 7r Combine like terms: -4r + 7r = 3r -9 + 3r = -7r + 7r Combine like terms: -7r + 7r = 0 -9 + 3r = 0 Add '9' to each side of the equation. -9 + 9 + 3r = 0 + 9 Combine like terms: -9 + 9 = 0 0 + 3r = 0 + 9 3r = 0 + 9 Combine like terms: 0 + 9 = 9 3r = 9 Divide each side by '3'. r = 3 Simplifying r = 3
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