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Simplifying -2(r + -2) = -10 Reorder the terms: -2(-2 + r) = -10 (-2 * -2 + r * -2) = -10 (4 + -2r) = -10 Solving 4 + -2r = -10 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + -2r = -10 + -4 Combine like terms: 4 + -4 = 0 0 + -2r = -10 + -4 -2r = -10 + -4 Combine like terms: -10 + -4 = -14 -2r = -14 Divide each side by '-2'. r = 7 Simplifying r = 7
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