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Simplifying -8(r + 7) = -20 + -2r Reorder the terms: -8(7 + r) = -20 + -2r (7 * -8 + r * -8) = -20 + -2r (-56 + -8r) = -20 + -2r Solving -56 + -8r = -20 + -2r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '2r' to each side of the equation. -56 + -8r + 2r = -20 + -2r + 2r Combine like terms: -8r + 2r = -6r -56 + -6r = -20 + -2r + 2r Combine like terms: -2r + 2r = 0 -56 + -6r = -20 + 0 -56 + -6r = -20 Add '56' to each side of the equation. -56 + 56 + -6r = -20 + 56 Combine like terms: -56 + 56 = 0 0 + -6r = -20 + 56 -6r = -20 + 56 Combine like terms: -20 + 56 = 36 -6r = 36 Divide each side by '-6'. r = -6 Simplifying r = -6
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