7х2 - 1 - (2х + 1)(3х - 2) = х2
ответ: -1
7х2-1-6х2+4х-3х+2=х2
х2+1+х=х2
х2-х2+х=-1
х=-1
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7х2-1-6х2+4х-3х+2=х2
х2+1+х=х2
х2-х2+х=-1
х=-1