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Simplifying -8 = -1r + -3r Combine like terms: -1r + -3r = -4r -8 = -4r Solving -8 = -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. -8 + 4r = -4r + 4r Combine like terms: -4r + 4r = 0 -8 + 4r = 0 Add '8' to each side of the equation. -8 + 8 + 4r = 0 + 8 Combine like terms: -8 + 8 = 0 0 + 4r = 0 + 8 4r = 0 + 8 Combine like terms: 0 + 8 = 8 4r = 8 Divide each side by '4'. r = 2 Simplifying r = 2
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