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x0=4= m-ce zerowe
x0=-b/a
-b/a=4 /*a
-b=4a
b=-4a
,,,,,,,,,,,,,
3=1*a +b
3=a-4a
3=-3a /;(-3)
a=-1 b=-4*(-1)=4
y=-x+4 = szukany wzór