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Simplifying -4(-7r + 3) = 212 Reorder the terms: -4(3 + -7r) = 212 (3 * -4 + -7r * -4) = 212 (-12 + 28r) = 212 Solving -12 + 28r = 212 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 + 28r = 212 + 12 Combine like terms: -12 + 12 = 0 0 + 28r = 212 + 12 28r = 212 + 12 Combine like terms: 212 + 12 = 224 28r = 224 Divide each side by '28'. r = 8 Simplifying r = 8
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