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Wojtek jest na posterunku :D
x+4(x-6)+(2-x)(2+x)=0
x+4x-24+4+2x-2x-x^2=0
-x^2+5x-20=0
a=-1, b=5, c= -20
Δ=b2-4ac
Δ=25-4(-1*(-20))
Δ=25-80
Δ=-55