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Simplifying -12 = 3 + -2r Solving -12 = 3 + -2r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '2r' to each side of the equation. -12 + 2r = 3 + -2r + 2r Combine like terms: -2r + 2r = 0 -12 + 2r = 3 + 0 -12 + 2r = 3 Add '12' to each side of the equation. -12 + 12 + 2r = 3 + 12 Combine like terms: -12 + 12 = 0 0 + 2r = 3 + 12 2r = 3 + 12 Combine like terms: 3 + 12 = 15 2r = 15 Divide each side by '2'. r = 7.5 Simplifying r = 7.5
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