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Simplifying 3r + -7 + 5r = 10 Reorder the terms: -7 + 3r + 5r = 10 Combine like terms: 3r + 5r = 8r -7 + 8r = 10 Solving -7 + 8r = 10 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + 8r = 10 + 7 Combine like terms: -7 + 7 = 0 0 + 8r = 10 + 7 8r = 10 + 7 Combine like terms: 10 + 7 = 17 8r = 17 Divide each side by '8'. r = 2.125 Simplifying r = 2.125
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