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Simplifying -5 + -1(r + 5) = -28 + -4r Reorder the terms: -5 + -1(5 + r) = -28 + -4r -5 + (5 * -1 + r * -1) = -28 + -4r -5 + (-5 + -1r) = -28 + -4r Combine like terms: -5 + -5 = -10 -10 + -1r = -28 + -4r Solving -10 + -1r = -28 + -4r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '4r' to each side of the equation. -10 + -1r + 4r = -28 + -4r + 4r Combine like terms: -1r + 4r = 3r -10 + 3r = -28 + -4r + 4r Combine like terms: -4r + 4r = 0 -10 + 3r = -28 + 0 -10 + 3r = -28 Add '10' to each side of the equation. -10 + 10 + 3r = -28 + 10 Combine like terms: -10 + 10 = 0 0 + 3r = -28 + 10 3r = -28 + 10 Combine like terms: -28 + 10 = -18 3r = -18 Divide each side by '3'. r = -6 Simplifying r = -6
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