If it's not what You are looking for type in the equation solver your own equation and let us solve it.
31+x=420
We move all terms to the left:
31+x-(420)=0
We add all the numbers together, and all the variables
x-389=0
We move all terms containing x to the left, all other terms to the right
x=389
| 4x+15-2x+25=2 | | 8(x-9)=-5(x+9) | | 4+5x=-61 | | 3/4r=9/10 | | -7/2x=1/2x-1/7 | | f/8-3=4 | | 3+5r=8 | | -9-5(6x-7)=-13 | | 8t^2-14t-85=0 | | 8^(3x)=2,097,152 | | -3(-4x+4)=-11 | | 4r+1=13 | | -5(-7x-2)+2x=5 | | 5x-11-3x+13=-4 | | 4.7+0.2p=6.1 | | -b/6=10 | | 6(4x-8)=-3x | | 8x-5=16+2x | | -b/6=20 | | -6x-3+8x=-7x+3 | | -7x-8+9x=-2 | | 27/36=x/12 | | -3/4(4/5x+12)=-6 | | -5x-2=-6x+4 | | 4^-2x=16 | | (4t^2)+80t+76=0 | | -10x-225=-235 | | -44-11n=11 | | X2+4.5x+5.0625=0 | | 0.3x+4=30.1 | | x*7.2*1.1/16*1.05=543200 | | 0.3x=30.1+4 |