If it's not what You are looking for type in the equation solver your own equation and let us solve it.
x+3-12=2x
We move all terms to the left:
x+3-12-(2x)=0
We add all the numbers together, and all the variables
-1x-9=0
We move all terms containing x to the left, all other terms to the right
-x=9
x=9/-1
x=-9
| (5x+1)+(18x+11)+62=x | | 5(v-7)+3=56+3v | | 4+2(9x-5)+3=27 | | 10n-10n+n-1=13 | | x+3+12=2x | | x-36=24-4x | | 11x-2.5x=(11-2.5)x | | A=1/2πr | | 5z-3z+-4=-18 | | 2x+19+x+19=14 | | 17h-13h-h+3=15 | | -90=-10(q-91) | | 148=2x+16 | | P=78+p-1 | | 2x+19-x+19=14 | | 5(v-5)-3=-5(-5v+8)-2v | | 8-m/2=14 | | -4x+28x=7x+119 | | ?x=9.2 | | -9+9x+2-2x=-28 | | 175m-75m+48,750=50,750-150m | | 1/2m-5=-(3/2) | | x+6.9=29 | | -12u+u=11 | | x2–9=16 | | 6x-6x+18=18 | | x+6.9=1.9 | | -5s+-2s=-14 | | x-7+7=2x-10 | | 3d-3d+5d=15 | | 6p+3=10p-5-4p | | 12x^2+28x-49=0 |