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Simplifying 2r = 2(2 + -1r) 2r = (2 * 2 + -1r * 2) 2r = (4 + -2r) Solving 2r = 4 + -2r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '2r' to each side of the equation. 2r + 2r = 4 + -2r + 2r Combine like terms: 2r + 2r = 4r 4r = 4 + -2r + 2r Combine like terms: -2r + 2r = 0 4r = 4 + 0 4r = 4 Divide each side by '4'. r = 1 Simplifying r = 1
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