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Simplifying (7r)(5r + 2r) = 0 Remove parenthesis around (7r) 7r(5r + 2r) = 0 Combine like terms: 5r + 2r = 7r 7r(7r) = 0 Remove parenthesis around (7r) 7r * 7r = 0 Reorder the terms for easier multiplication: 7 * 7r * r = 0 Multiply 7 * 7 49r * r = 0 Multiply r * r 49r2 = 0 Solving 49r2 = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Divide each side by '49'. r2 = 0 Simplifying r2 = 0 Take the square root of each side: r = {0}
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