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Simplifying -9 + -3r = -4r Solving -9 + -3r = -4r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '4r' to each side of the equation. -9 + -3r + 4r = -4r + 4r Combine like terms: -3r + 4r = 1r -9 + 1r = -4r + 4r Combine like terms: -4r + 4r = 0 -9 + 1r = 0 Add '9' to each side of the equation. -9 + 9 + 1r = 0 + 9 Combine like terms: -9 + 9 = 0 0 + 1r = 0 + 9 1r = 0 + 9 Combine like terms: 0 + 9 = 9 1r = 9 Divide each side by '1'. r = 9 Simplifying r = 9
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