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Simplifying 5 + 4r = -15 + 8r Solving 5 + 4r = -15 + 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. 5 + 4r + -8r = -15 + 8r + -8r Combine like terms: 4r + -8r = -4r 5 + -4r = -15 + 8r + -8r Combine like terms: 8r + -8r = 0 5 + -4r = -15 + 0 5 + -4r = -15 Add '-5' to each side of the equation. 5 + -5 + -4r = -15 + -5 Combine like terms: 5 + -5 = 0 0 + -4r = -15 + -5 -4r = -15 + -5 Combine like terms: -15 + -5 = -20 -4r = -20 Divide each side by '-4'. r = 5 Simplifying r = 5
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