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Simplifying (pq) * r = p(qr) Multiply pq * r pqr = p(qr) Multiply p * qr pqr = pqr Add '-1pqr' to each side of the equation. pqr + -1pqr = pqr + -1pqr Combine like terms: pqr + -1pqr = 0 0 = pqr + -1pqr Combine like terms: pqr + -1pqr = 0 0 = 0 Solving 0 = 0 Couldn't find a variable to solve for. This equation is an identity, all real numbers are solutions.
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