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Simplifying 3(3r + -4) = -20 Reorder the terms: 3(-4 + 3r) = -20 (-4 * 3 + 3r * 3) = -20 (-12 + 9r) = -20 Solving -12 + 9r = -20 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 + 9r = -20 + 12 Combine like terms: -12 + 12 = 0 0 + 9r = -20 + 12 9r = -20 + 12 Combine like terms: -20 + 12 = -8 9r = -8 Divide each side by '9'. r = -0.8888888889 Simplifying r = -0.8888888889
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