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Simplifying (-7q)(-3r) = 0 Remove parenthesis around (-7q) -7q(-3r) = 0 Remove parenthesis around (-3r) -7q * -3r = 0 Reorder the terms for easier multiplication: -7 * -3q * r = 0 Multiply -7 * -3 21q * r = 0 Multiply q * r 21qr = 0 Solving 21qr = 0 Solving for variable 'q'. Move all terms containing q to the left, all other terms to the right. Divide each side by '21'. qr = 0 Simplifying qr = 0 The solution to this equation could not be determined.
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