f(x)=4x+2b
x=1/2
0=4*1/2+2b
0=2+2b
-2b=2//:(-2)
b=(-1)
f(x)=4x+2b x=1/2
4*1/2+2b=0
2+2b=0
2b=-2
b=-1
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f(x)=4x+2b
x=1/2
0=4*1/2+2b
0=2+2b
-2b=2//:(-2)
b=(-1)
f(x)=4x+2b x=1/2
4*1/2+2b=0
2+2b=0
2b=-2
b=-1