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Simplifying 2r2 + 4r = 2r2 + -1r Reorder the terms: 4r + 2r2 = 2r2 + -1r Reorder the terms: 4r + 2r2 = -1r + 2r2 Add '-2r2' to each side of the equation. 4r + 2r2 + -2r2 = -1r + 2r2 + -2r2 Combine like terms: 2r2 + -2r2 = 0 4r + 0 = -1r + 2r2 + -2r2 4r = -1r + 2r2 + -2r2 Combine like terms: 2r2 + -2r2 = 0 4r = -1r + 0 4r = -1r Solving 4r = -1r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add 'r' to each side of the equation. 4r + r = -1r + r Combine like terms: 4r + r = 5r 5r = -1r + r Combine like terms: -1r + r = 0 5r = 0 Divide each side by '5'. r = 0 Simplifying r = 0
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