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Simplifying -12 + -7r = -8r Solving -12 + -7r = -8r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '8r' to each side of the equation. -12 + -7r + 8r = -8r + 8r Combine like terms: -7r + 8r = 1r -12 + 1r = -8r + 8r Combine like terms: -8r + 8r = 0 -12 + 1r = 0 Add '12' to each side of the equation. -12 + 12 + 1r = 0 + 12 Combine like terms: -12 + 12 = 0 0 + 1r = 0 + 12 1r = 0 + 12 Combine like terms: 0 + 12 = 12 1r = 12 Divide each side by '1'. r = 12 Simplifying r = 12
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