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Simplifying 3r + -8 = 7 + 8r Reorder the terms: -8 + 3r = 7 + 8r Solving -8 + 3r = 7 + 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. -8 + 3r + -8r = 7 + 8r + -8r Combine like terms: 3r + -8r = -5r -8 + -5r = 7 + 8r + -8r Combine like terms: 8r + -8r = 0 -8 + -5r = 7 + 0 -8 + -5r = 7 Add '8' to each side of the equation. -8 + 8 + -5r = 7 + 8 Combine like terms: -8 + 8 = 0 0 + -5r = 7 + 8 -5r = 7 + 8 Combine like terms: 7 + 8 = 15 -5r = 15 Divide each side by '-5'. r = -3 Simplifying r = -3
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