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Simplifying -4(r + 1) = -164 Reorder the terms: -4(1 + r) = -164 (1 * -4 + r * -4) = -164 (-4 + -4r) = -164 Solving -4 + -4r = -164 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 = -164 + 4 Combine like terms: -4 + 4 = 0 0 + -4r = -164 + 4 -4r = -164 + 4 Combine like terms: -164 + 4 = -160 -4r = -160 Divide each side by '-4'. r = 40 Simplifying r = 40
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