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Simplifying 4 + 2r = -2(2 + r) 4 + 2r = (2 * -2 + r * -2) 4 + 2r = (-4 + -2r) Solving 4 + 2r = -4 + -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. 4 + 2r + 2r = -4 + -2r + 2r Combine like terms: 2r + 2r = 4r 4 + 4r = -4 + -2r + 2r Combine like terms: -2r + 2r = 0 4 + 4r = -4 + 0 4 + 4r = -4 Add '-4' to each side of the equation. 4 + -4 + 4r = -4 + -4 Combine like terms: 4 + -4 = 0 0 + 4r = -4 + -4 4r = -4 + -4 Combine like terms: -4 + -4 = -8 4r = -8 Divide each side by '4'. r = -2 Simplifying r = -2
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