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