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Simplifying 8 = 3r + -7 Reorder the terms: 8 = -7 + 3r Solving 8 = -7 + 3r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-3r' to each side of the equation. 8 + -3r = -7 + 3r + -3r Combine like terms: 3r + -3r = 0 8 + -3r = -7 + 0 8 + -3r = -7 Add '-8' to each side of the equation. 8 + -8 + -3r = -7 + -8 Combine like terms: 8 + -8 = 0 0 + -3r = -7 + -8 -3r = -7 + -8 Combine like terms: -7 + -8 = -15 -3r = -15 Divide each side by '-3'. r = 5 Simplifying r = 5
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