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Simplifying 3r + -20 = 12 + 7r Reorder the terms: -20 + 3r = 12 + 7r Solving -20 + 3r = 12 + 7r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-7r' to each side of the equation. -20 + 3r + -7r = 12 + 7r + -7r Combine like terms: 3r + -7r = -4r -20 + -4r = 12 + 7r + -7r Combine like terms: 7r + -7r = 0 -20 + -4r = 12 + 0 -20 + -4r = 12 Add '20' to each side of the equation. -20 + 20 + -4r = 12 + 20 Combine like terms: -20 + 20 = 0 0 + -4r = 12 + 20 -4r = 12 + 20 Combine like terms: 12 + 20 = 32 -4r = 32 Divide each side by '-4'. r = -8 Simplifying r = -8
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