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Simplifying -2(r + 4) + -4 = -10 Reorder the terms: -2(4 + r) + -4 = -10 (4 * -2 + r * -2) + -4 = -10 (-8 + -2r) + -4 = -10 Reorder the terms: -8 + -4 + -2r = -10 Combine like terms: -8 + -4 = -12 -12 + -2r = -10 Solving -12 + -2r = -10 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '12' to each side of the equation. -12 + 12 + -2r = -10 + 12 Combine like terms: -12 + 12 = 0 0 + -2r = -10 + 12 -2r = -10 + 12 Combine like terms: -10 + 12 = 2 -2r = 2 Divide each side by '-2'. r = -1 Simplifying r = -1
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