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Simplifying -2(4 + r) = 4 (4 * -2 + r * -2) = 4 (-8 + -2r) = 4 Solving -8 + -2r = 4 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '8' to each side of the equation. -8 + 8 + -2r = 4 + 8 Combine like terms: -8 + 8 = 0 0 + -2r = 4 + 8 -2r = 4 + 8 Combine like terms: 4 + 8 = 12 -2r = 12 Divide each side by '-2'. r = -6 Simplifying r = -6
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