If it's not what You are looking for type in the equation solver your own equation and let us solve it.
2x-1+2x+1+2x+3=21
We move all terms to the left:
2x-1+2x+1+2x+3-(21)=0
We add all the numbers together, and all the variables
6x-18=0
We move all terms containing x to the left, all other terms to the right
6x=18
x=18/6
x=3
| 54x−60+36−6x=−8 | | -67/36+2x=13/6x-5/3 | | (2x-6)(-3x+11)=0 | | x-4=3(x-2) | | 13x-5=7x+2 | | 8x-3-2x+12=27 | | 277/42+30/7x=x+5/3 | | 10x+68=-4(1-7x) | | 10m+8=7m+18 | | t−3=2 | | 7+4(2a+25)=-13 | | 9x−12=5x+2(2x−6) | | 2x+x+2x+x=84 | | 8x-(2x1)=3x-10 | | Y=-3x+16/3 | | 6x+8x-5647=132 | | 7u−1=6u−9 | | 22+0.15p=40 | | 8m-34=14 | | 1/3+a=1/4 | | 6k=6+9k | | v/4-8=16 | | 8+5f=4f+7 | | x(5x+4)=-48 | | 8y-(5y+12)=16 | | 3.5=1.4-0.5y | | 7k+15=50 | | x2+x=7 | | 6x-4x-2x=6x-6 | | 2m^2-6m-108=0 | | 24=-8u+3(u-7) | | 7x+8=x-17-4x |