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