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Simplifying 4 + 8r = -4 + 7r Solving 4 + 8r = -4 + 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. 4 + 8r + -7r = -4 + 7r + -7r Combine like terms: 8r + -7r = 1r 4 + 1r = -4 + 7r + -7r Combine like terms: 7r + -7r = 0 4 + 1r = -4 + 0 4 + 1r = -4 Add '-4' to each side of the equation. 4 + -4 + 1r = -4 + -4 Combine like terms: 4 + -4 = 0 0 + 1r = -4 + -4 1r = -4 + -4 Combine like terms: -4 + -4 = -8 1r = -8 Divide each side by '1'. r = -8 Simplifying r = -8
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