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Simplifying -2(r + 5) = 8r + -20 Reorder the terms: -2(5 + r) = 8r + -20 (5 * -2 + r * -2) = 8r + -20 (-10 + -2r) = 8r + -20 Reorder the terms: -10 + -2r = -20 + 8r Solving -10 + -2r = -20 + 8r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-8r' to each side of the equation. -10 + -2r + -8r = -20 + 8r + -8r Combine like terms: -2r + -8r = -10r -10 + -10r = -20 + 8r + -8r Combine like terms: 8r + -8r = 0 -10 + -10r = -20 + 0 -10 + -10r = -20 Add '10' to each side of the equation. -10 + 10 + -10r = -20 + 10 Combine like terms: -10 + 10 = 0 0 + -10r = -20 + 10 -10r = -20 + 10 Combine like terms: -20 + 10 = -10 -10r = -10 Divide each side by '-10'. r = 1 Simplifying r = 1
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