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Simplifying 10r + -15 = 12 Reorder the terms: -15 + 10r = 12 Solving -15 + 10r = 12 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '15' to each side of the equation. -15 + 15 + 10r = 12 + 15 Combine like terms: -15 + 15 = 0 0 + 10r = 12 + 15 10r = 12 + 15 Combine like terms: 12 + 15 = 27 10r = 27 Divide each side by '10'. r = 2.7 Simplifying r = 2.7
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