If it's not what You are looking for type in the equation solver your own equation and let us solve it.
400=20d^87d
We move all terms to the left:
400-(20d^87d)=0
We do not support edpression: d^87d
| -3.7+z=14.1 | | 2x+x=6x-10 | | 12=5m+3÷4 | | 23k=6.9 | | 14(x-2)=132-281(x) | | 5u+14=104 | | 8+2x-x=14 | | y=-6+54 | | X2+10x+5=-10 | | 4(x+0.25)=7x37 | | 4×+y=20 | | 2/3a-5=1/3a+5 | | 3/6=10/x | | -7(6-d)=49 | | 10x+9x=34+x | | -7(b-6)=49 | | 2.9r=13-6.7r | | -7(b-6)=12 | | 9x-8-6x=1 | | -t+124=-2 | | Y=0.11x+18.17 | | -16t^2+24t=9 | | -1/4(x)+3/4=12 | | -4.6/y=-2.3 | | 3x+2+4x=16 | | 8p-11=7p+3 | | -1+3y=-9 | | 1/6x-2/3=1/3x+1/2 | | 54+x+71=180 | | (x-2)/4=5 | | m=75 | | 9k+7=5k+15 |