20x^6+x^5=x^4 /-x^4
20x^6+x^5-x^4=0
x^4(20x^2+x-1)=0
x^4=0
x=0
20x^2+x-1=0
Δ=1-4*20*(-1)
Δ=81
√Δ=9
x1=(-1+9)/40=1/5
x2=(-1-9)/40=-1/4
x=0 v x=1/5 v x=-1/4
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20x^6+x^5=x^4 /-x^4
20x^6+x^5-x^4=0
x^4(20x^2+x-1)=0
x^4=0
x=0
20x^2+x-1=0
Δ=1-4*20*(-1)
Δ=81
√Δ=9
x1=(-1+9)/40=1/5
x2=(-1-9)/40=-1/4
x=0 v x=1/5 v x=-1/4