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Simplifying 7r + 4(5 + -3r) = 0 7r + (5 * 4 + -3r * 4) = 0 7r + (20 + -12r) = 0 Reorder the terms: 20 + 7r + -12r = 0 Combine like terms: 7r + -12r = -5r 20 + -5r = 0 Solving 20 + -5r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-20' to each side of the equation. 20 + -20 + -5r = 0 + -20 Combine like terms: 20 + -20 = 0 0 + -5r = 0 + -20 -5r = 0 + -20 Combine like terms: 0 + -20 = -20 -5r = -20 Divide each side by '-5'. r = 4 Simplifying r = 4
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