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Simplifying 9r + -4(3 + r) = 0 9r + (3 * -4 + r * -4) = 0 9r + (-12 + -4r) = 0 Reorder the terms: -12 + 9r + -4r = 0 Combine like terms: 9r + -4r = 5r -12 + 5r = 0 Solving -12 + 5r = 0 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 + 5r = 0 + 12 Combine like terms: -12 + 12 = 0 0 + 5r = 0 + 12 5r = 0 + 12 Combine like terms: 0 + 12 = 12 5r = 12 Divide each side by '5'. r = 2.4 Simplifying r = 2.4
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