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Simplifying -15 = -12 + 3r Solving -15 = -12 + 3r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-3r' to each side of the equation. -15 + -3r = -12 + 3r + -3r Combine like terms: 3r + -3r = 0 -15 + -3r = -12 + 0 -15 + -3r = -12 Add '15' to each side of the equation. -15 + 15 + -3r = -12 + 15 Combine like terms: -15 + 15 = 0 0 + -3r = -12 + 15 -3r = -12 + 15 Combine like terms: -12 + 15 = 3 -3r = 3 Divide each side by '-3'. r = -1 Simplifying r = -1
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