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