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Simplifying 4 = 1 + 2r + -1r Combine like terms: 2r + -1r = 1r 4 = 1 + 1r Solving 4 = 1 + 1r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-1r' to each side of the equation. 4 + -1r = 1 + 1r + -1r Combine like terms: 1r + -1r = 0 4 + -1r = 1 + 0 4 + -1r = 1 Add '-4' to each side of the equation. 4 + -4 + -1r = 1 + -4 Combine like terms: 4 + -4 = 0 0 + -1r = 1 + -4 -1r = 1 + -4 Combine like terms: 1 + -4 = -3 -1r = -3 Divide each side by '-1'. r = 3 Simplifying r = 3
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