If it's not what You are looking for type in the equation solver your own equation and let us solve it.
x+2x^4=20
We move all terms to the left:
x+2x^4-(20)=0
We do not support expression: x^4
| 175m-75m+47.750=51.250-150m | | 1/2x+5=3x+221/2 | | 0.13x+10=0.11x+23 | | 4.4g+5=2.4g+11 | | 0.4(x=2)=2 | | 16=80(4x) | | x+9+(-7x)=x+9 | | 7h-26=4 | | -3z+5-z+2=-4z+7 | | 3^3x-28(3^x-1)=1 | | x*0.05=150000 | | x*0.05=150.000 | | 0.4x+15.4=x-9.08 | | 15n=855 | | 2.6+x=4x+14 | | n^2+2n+3=443 | | 3(m+2=15 | | 5x-2=40-1x | | 7.x+6=2x-8 | | 22g=462 | | 13x+25=3x-15 | | 5x-23=7x-1=60 | | 10x-48=2x+16 | | x/30+8=98 | | x/135=24 | | 17+2.8=c2.3 | | 6x6x6x6x6x6x6x=6x | | 7x-1=8x-114=60 | | -0.5x+14=6 | | 7x-1=8x-114=180 | | 2/9=n/16 | | 12y+6=6y+1 |