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Simplifying -2(-2 + 4r) = -10 + 8r (-2 * -2 + 4r * -2) = -10 + 8r (4 + -8r) = -10 + 8r Solving 4 + -8r = -10 + 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. 4 + -8r + -8r = -10 + 8r + -8r Combine like terms: -8r + -8r = -16r 4 + -16r = -10 + 8r + -8r Combine like terms: 8r + -8r = 0 4 + -16r = -10 + 0 4 + -16r = -10 Add '-4' to each side of the equation. 4 + -4 + -16r = -10 + -4 Combine like terms: 4 + -4 = 0 0 + -16r = -10 + -4 -16r = -10 + -4 Combine like terms: -10 + -4 = -14 -16r = -14 Divide each side by '-16'. r = 0.875 Simplifying r = 0.875
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