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