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Simplifying 3r + 5r + -15 + 8 = 0 Reorder the terms: -15 + 8 + 3r + 5r = 0 Combine like terms: -15 + 8 = -7 -7 + 3r + 5r = 0 Combine like terms: 3r + 5r = 8r -7 + 8r = 0 Solving -7 + 8r = 0 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 = 0 + 7 Combine like terms: -7 + 7 = 0 0 + 8r = 0 + 7 8r = 0 + 7 Combine like terms: 0 + 7 = 7 8r = 7 Divide each side by '8'. r = 0.875 Simplifying r = 0.875
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