If it's not what You are looking for type in the equation solver your own equation and let us solve it.
3u=645
We move all terms to the left:
3u-(645)=0
We move all terms containing u to the left, all other terms to the right
3u=645
u=645/3
u=215
| –10+3d=10+8d | | -8(2+x)=48 | | 6x-3(x+6)=-21 | | w+7=23 | | (1/2)(4x=10)+5=x-11 | | 270=18z | | 6xx12x=72 | | 5(6x)=90 | | 0.5-2x-16=0 | | 2(m+3)–4(2m+1)=m–3(2+m) | | 2x2-7=209 | | 94=2b | | 22-28x+56+60x=8x-24+46+12x | | F(×)=2×f(3)=2(3)=6 | | 3(r+5)=8r | | 20-x/20=15 | | 1=7/0x | | 4+4(x-2)=(x+1)-x | | 9d−3d=18 | | x^{4}+7x^{3}+12x^{2}=0 | | 99c+5=94 | | 4(x+12)-17=35 | | -22x=-198 | | 32m=-256 | | 3x×2x×x=48 | | 3h×2h×h=48 | | 4((34-y)/4)=34 | | 3x+8=1/2(x-4) | | k÷8÷21=14 | | x6-6=-5 | | 4x+(34-4x)=34 | | 3b-4-6=-4 |