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Simplifying 4r(7r) = 0 Remove parenthesis around (7r) 4r * 7r = 0 Reorder the terms for easier multiplication: 4 * 7r * r = 0 Multiply 4 * 7 28r * r = 0 Multiply r * r 28r2 = 0 Solving 28r2 = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Divide each side by '28'. r2 = 0 Simplifying r2 = 0 Take the square root of each side: r = {0}
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