(9х+7+6)(9х+7-6)=0
(9х+13(9х+1)=0
9х¹+13=0. х¹=-13/9
9х²+1=0. х²=-1/9
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(9х+7+6)(9х+7-6)=0
(9х+13(9х+1)=0
9х¹+13=0. х¹=-13/9
9х²+1=0. х²=-1/9