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Simplifying -15 = 7r + 5r Combine like terms: 7r + 5r = 12r -15 = 12r Solving -15 = 12r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-12r' to each side of the equation. -15 + -12r = 12r + -12r Combine like terms: 12r + -12r = 0 -15 + -12r = 0 Add '15' to each side of the equation. -15 + 15 + -12r = 0 + 15 Combine like terms: -15 + 15 = 0 0 + -12r = 0 + 15 -12r = 0 + 15 Combine like terms: 0 + 15 = 15 -12r = 15 Divide each side by '-12'. r = -1.25 Simplifying r = -1.25
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