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Simplifying 2(2 + -5r) = 4 + 8r (2 * 2 + -5r * 2) = 4 + 8r (4 + -10r) = 4 + 8r Add '-4' to each side of the equation. 4 + -4 + -10r = 4 + -4 + 8r Combine like terms: 4 + -4 = 0 0 + -10r = 4 + -4 + 8r -10r = 4 + -4 + 8r Combine like terms: 4 + -4 = 0 -10r = 0 + 8r -10r = 8r Solving -10r = 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. -10r + -8r = 8r + -8r Combine like terms: -10r + -8r = -18r -18r = 8r + -8r Combine like terms: 8r + -8r = 0 -18r = 0 Divide each side by '-18'. r = 0 Simplifying r = 0
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