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Simplifying 3 + 2r + -1 = 7r + 2 + -4r Reorder the terms: 3 + -1 + 2r = 7r + 2 + -4r Combine like terms: 3 + -1 = 2 2 + 2r = 7r + 2 + -4r Reorder the terms: 2 + 2r = 2 + 7r + -4r Combine like terms: 7r + -4r = 3r 2 + 2r = 2 + 3r Add '-2' to each side of the equation. 2 + -2 + 2r = 2 + -2 + 3r Combine like terms: 2 + -2 = 0 0 + 2r = 2 + -2 + 3r 2r = 2 + -2 + 3r Combine like terms: 2 + -2 = 0 2r = 0 + 3r 2r = 3r Solving 2r = 3r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-3r' to each side of the equation. 2r + -3r = 3r + -3r Combine like terms: 2r + -3r = -1r -1r = 3r + -3r Combine like terms: 3r + -3r = 0 -1r = 0 Divide each side by '-1'. r = 0 Simplifying r = 0
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