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Simplifying -12 = 4r + 8 Reorder the terms: -12 = 8 + 4r Solving -12 = 8 + 4r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-4r' to each side of the equation. -12 + -4r = 8 + 4r + -4r Combine like terms: 4r + -4r = 0 -12 + -4r = 8 + 0 -12 + -4r = 8 Add '12' to each side of the equation. -12 + 12 + -4r = 8 + 12 Combine like terms: -12 + 12 = 0 0 + -4r = 8 + 12 -4r = 8 + 12 Combine like terms: 8 + 12 = 20 -4r = 20 Divide each side by '-4'. r = -5 Simplifying r = -5
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