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Simplifying 2(r + -7) = -20 + -4r Reorder the terms: 2(-7 + r) = -20 + -4r (-7 * 2 + r * 2) = -20 + -4r (-14 + 2r) = -20 + -4r Solving -14 + 2r = -20 + -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. -14 + 2r + 4r = -20 + -4r + 4r Combine like terms: 2r + 4r = 6r -14 + 6r = -20 + -4r + 4r Combine like terms: -4r + 4r = 0 -14 + 6r = -20 + 0 -14 + 6r = -20 Add '14' to each side of the equation. -14 + 14 + 6r = -20 + 14 Combine like terms: -14 + 14 = 0 0 + 6r = -20 + 14 6r = -20 + 14 Combine like terms: -20 + 14 = -6 6r = -6 Divide each side by '6'. r = -1 Simplifying r = -1
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