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Simplifying -2 + -2r + -4 = -12 Reorder the terms: -2 + -4 + -2r = -12 Combine like terms: -2 + -4 = -6 -6 + -2r = -12 Solving -6 + -2r = -12 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + -2r = -12 + 6 Combine like terms: -6 + 6 = 0 0 + -2r = -12 + 6 -2r = -12 + 6 Combine like terms: -12 + 6 = -6 -2r = -6 Divide each side by '-2'. r = 3 Simplifying r = 3
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