х3+х2-(2х2-3х+4х-6)=х3-х2
х3+х2-2х2+3х+4х-6=х3-х2
х3-х2+7х-6=х3-х2
х3-х2-х3+х2+7х=6
7х=6
х=6/7
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х3+х2-(2х2-3х+4х-6)=х3-х2
х3+х2-2х2+3х+4х-6=х3-х2
х3-х2+7х-6=х3-х2
х3-х2-х3+х2+7х=6
7х=6
х=6/7