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Simplifying 12 + -4(r + 12) = 20 Reorder the terms: 12 + -4(12 + r) = 20 12 + (12 * -4 + r * -4) = 20 12 + (-48 + -4r) = 20 Combine like terms: 12 + -48 = -36 -36 + -4r = 20 Solving -36 + -4r = 20 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '36' to each side of the equation. -36 + 36 + -4r = 20 + 36 Combine like terms: -36 + 36 = 0 0 + -4r = 20 + 36 -4r = 20 + 36 Combine like terms: 20 + 36 = 56 -4r = 56 Divide each side by '-4'. r = -14 Simplifying r = -14
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