task/29424356 ---------------------
49b²+14b +1 =(7b)² +2*7b*1 +1²= (7b+1)² * * * (7b+1) (7b+1) * * * --- uz⁶ +uy⁶ - yz⁶ - y⁷ =u(z⁶ +y⁶) - z(z⁶ +y⁶) = (u- z)(z⁶ + y⁶) .
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task/29424356 ---------------------
49b²+14b +1 =(7b)² +2*7b*1 +1²= (7b+1)² * * * (7b+1) (7b+1) * * * --- uz⁶ +uy⁶ - yz⁶ - y⁷ =u(z⁶ +y⁶) - z(z⁶ +y⁶) = (u- z)(z⁶ + y⁶) .