если P(x)=ax+b, то P(-x)=-ax+b
P(x)+3P(-x)=ax+b-3ax+3b=4x+8
a-3a=4; a=-2
b+3b=8;b=2
P(x)=-2x+2
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если P(x)=ax+b, то P(-x)=-ax+b
P(x)+3P(-x)=ax+b-3ax+3b=4x+8
a-3a=4; a=-2
b+3b=8;b=2
P(x)=-2x+2