If it's not what You are looking for type in the equation solver your own equation and let us solve it.
x+3x+1=90
We move all terms to the left:
x+3x+1-(90)=0
We add all the numbers together, and all the variables
4x-89=0
We move all terms containing x to the left, all other terms to the right
4x=89
x=89/4
x=22+1/4
| 145-35=x | | -5/6w=9 | | 15+90=x | | 152-28=x | | 152+28=x | | z+3(2+2)=14+2z | | 15a-7=2a+4 | | 9x-4=6-x | | -4+2a=-3a-12 | | 7m+14=20+5m | | 11-3x=(-31) | | 6p+4p=120 | | 52+4y-4+3y=180 | | (5x+7)2=17x2+84x+46 | | 2+7x2-9x=0 | | (9x+18)(8x-6)=0 | | -56x=8x2 | | 2x-2(x-2)+8-3(2x+4)=0 | | 2/3x+4/6=0 | | 7x+3-2x-27=5x-6-3x | | -u+250=116 | | 252-u=127 | | a=7.b=-4 | | 4/5e+(-1)=-11 | | 3y+25=142 | | 2p+34=90 | | 6x-5x=5(x+2)-6 | | 0.4x=84 | | -8+5(x+2)=4x | | 7x-8x+2=3x-4 | | 15=x/20.48+7 | | 0.3x+x=169 |