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Simplifying 12 = 77 + -5r Solving 12 = 77 + -5r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '5r' to each side of the equation. 12 + 5r = 77 + -5r + 5r Combine like terms: -5r + 5r = 0 12 + 5r = 77 + 0 12 + 5r = 77 Add '-12' to each side of the equation. 12 + -12 + 5r = 77 + -12 Combine like terms: 12 + -12 = 0 0 + 5r = 77 + -12 5r = 77 + -12 Combine like terms: 77 + -12 = 65 5r = 65 Divide each side by '5'. r = 13 Simplifying r = 13
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