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Simplifying 7r + 4 = 8r + -4 Reorder the terms: 4 + 7r = 8r + -4 Reorder the terms: 4 + 7r = -4 + 8r Solving 4 + 7r = -4 + 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 + 7r + -8r = -4 + 8r + -8r Combine like terms: 7r + -8r = -1r 4 + -1r = -4 + 8r + -8r Combine like terms: 8r + -8r = 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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