2х^2-7х+3 8^x -9*2^x=2 ,1 х
2 - 7х^2 +1,8х= 2-3х
х^2 - 5х =х -5
-2х^2 +7х =3х
-2х^2 +5 = 5-4х
2-0,7х ^2+3х =х+2
253
420
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