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Simplifying 2r + -1r = 4r Combine like terms: 2r + -1r = 1r 1r = 4r Solving 1r = 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 = 4r + -4r Combine like terms: 1r + -4r = -3r -3r = 4r + -4r Combine like terms: 4r + -4r = 0 -3r = 0 Divide each side by '-3'. r = 0 Simplifying r = 0
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