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13x-2y+7-9x+y-4+x-3 =5x-y=5*0,2-(-1)=1+1=2
n do potęgi2 +n-7+3n do potęgi2 -n-9-n+16 dla n 1/2
n²+n-7+3n²-n-9-n+16=4n²-n=4*(1/2)²-1/2=4*1/4-1/2=1-1/2=1/2