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