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Simplifying 4(3r + -9) = 36 Reorder the terms: 4(-9 + 3r) = 36 (-9 * 4 + 3r * 4) = 36 (-36 + 12r) = 36 Solving -36 + 12r = 36 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '36' to each side of the equation. -36 + 36 + 12r = 36 + 36 Combine like terms: -36 + 36 = 0 0 + 12r = 36 + 36 12r = 36 + 36 Combine like terms: 36 + 36 = 72 12r = 72 Divide each side by '12'. r = 6 Simplifying r = 6
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