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