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Simplifying 2 + -1(2 + -1r) = 4(5 + -1r) 2 + (2 * -1 + -1r * -1) = 4(5 + -1r) 2 + (-2 + 1r) = 4(5 + -1r) Combine like terms: 2 + -2 = 0 0 + 1r = 4(5 + -1r) 1r = 4(5 + -1r) 1r = (5 * 4 + -1r * 4) 1r = (20 + -4r) Solving 1r = 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. 1r + 4r = 20 + -4r + 4r Combine like terms: 1r + 4r = 5r 5r = 20 + -4r + 4r Combine like terms: -4r + 4r = 0 5r = 20 + 0 5r = 20 Divide each side by '5'. r = 4 Simplifying r = 4
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