If it's not what You are looking for type in the equation solver your own equation and let us solve it.
4(10^x)=420
We move all terms to the left:
4(10^x)-(420)=0
We move all terms containing x to the left, all other terms to the right
410^x=420
x=420/1
x=420
| 2628=25(p+36) | | 2x+6.8+8x+1.4=90 | | 4(7x-4)+8=104 | | 80+(4x-22)=360 | | 3x−5=4x+9 | | 80+x+(3x-22)=360 | | -3=x-4x+9= | | X+6/4=x+1/2 | | 4x+x/2=17 | | y=16+2.16/3 | | 7y-4y-14=36.16 | | x/2=18-4x | | 5=7(2a+4)+3 | | 2x+5x-2=90 | | 2x+5x-2=990 | | 4y-5=90 | | 4x+x/2=18 | | -54-2v=-1v-8 | | 60.74=2s+17.76s | | T=2s+17.76s | | 7-3x=2(x+1( | | 8x+8=16x-24 | | F(-3)=4x+1 | | 80+(4x-22)=180 | | 7c+5=4 | | 7x+5x+2+9=6x+4+5x | | r^2+12r-16=-7 | | 3a+64=4 | | 7x+3+x=16+ | | 43=5x+18 | | (2)/(12)x=1000 | | a^2-10a+25=4 |