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Simplifying -5(-2r + 4) = -100 Reorder the terms: -5(4 + -2r) = -100 (4 * -5 + -2r * -5) = -100 (-20 + 10r) = -100 Solving -20 + 10r = -100 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '20' to each side of the equation. -20 + 20 + 10r = -100 + 20 Combine like terms: -20 + 20 = 0 0 + 10r = -100 + 20 10r = -100 + 20 Combine like terms: -100 + 20 = -80 10r = -80 Divide each side by '10'. r = -8 Simplifying r = -8
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