х^2+х+6=-х^2-3х+(-2+2х^2)
х^2+х+6=-х^2-3х-2+2х^2
х+3х=-6-2
4х=-8
х=-2
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х^2+х+6=-х^2-3х+(-2+2х^2)
х^2+х+6=-х^2-3х-2+2х^2
х+3х=-6-2
4х=-8
х=-2