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Simplifying 12 + -4(r + 2) = 20 Reorder the terms: 12 + -4(2 + r) = 20 12 + (2 * -4 + r * -4) = 20 12 + (-8 + -4r) = 20 Combine like terms: 12 + -8 = 4 4 + -4r = 20 Solving 4 + -4r = 20 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + -4r = 20 + -4 Combine like terms: 4 + -4 = 0 0 + -4r = 20 + -4 -4r = 20 + -4 Combine like terms: 20 + -4 = 16 -4r = 16 Divide each side by '-4'. r = -4 Simplifying r = -4
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