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Simplifying 7r + -1 + 5r = 13 Reorder the terms: -1 + 7r + 5r = 13 Combine like terms: 7r + 5r = 12r -1 + 12r = 13 Solving -1 + 12r = 13 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + 12r = 13 + 1 Combine like terms: -1 + 1 = 0 0 + 12r = 13 + 1 12r = 13 + 1 Combine like terms: 13 + 1 = 14 12r = 14 Divide each side by '12'. r = 1.166666667 Simplifying r = 1.166666667
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