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Simplifying -4(2 + -1r) = 28 (2 * -4 + -1r * -4) = 28 (-8 + 4r) = 28 Solving -8 + 4r = 28 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 = 28 + 8 Combine like terms: -8 + 8 = 0 0 + 4r = 28 + 8 4r = 28 + 8 Combine like terms: 28 + 8 = 36 4r = 36 Divide each side by '4'. r = 9 Simplifying r = 9
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