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Simplifying -4(r + 20) = -8 Reorder the terms: -4(20 + r) = -8 (20 * -4 + r * -4) = -8 (-80 + -4r) = -8 Solving -80 + -4r = -8 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '80' to each side of the equation. -80 + 80 + -4r = -8 + 80 Combine like terms: -80 + 80 = 0 0 + -4r = -8 + 80 -4r = -8 + 80 Combine like terms: -8 + 80 = 72 -4r = 72 Divide each side by '-4'. r = -18 Simplifying r = -18
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