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Simplifying 4r + (r + -2) = 0 Reorder the terms: 4r + (-2 + r) = 0 Remove parenthesis around (-2 + r) 4r + -2 + r = 0 Reorder the terms: -2 + 4r + r = 0 Combine like terms: 4r + r = 5r -2 + 5r = 0 Solving -2 + 5r = 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 + 5r = 0 + 2 Combine like terms: -2 + 2 = 0 0 + 5r = 0 + 2 5r = 0 + 2 Combine like terms: 0 + 2 = 2 5r = 2 Divide each side by '5'. r = 0.4 Simplifying r = 0.4
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