If it's not what You are looking for type in the equation solver your own equation and let us solve it.
660=x+12+3x
We move all terms to the left:
660-(x+12+3x)=0
We add all the numbers together, and all the variables
-(4x+12)+660=0
We get rid of parentheses
-4x-12+660=0
We add all the numbers together, and all the variables
-4x+648=0
We move all terms containing x to the left, all other terms to the right
-4x=-648
x=-648/-4
x=+162
| 2/5(15k+10)=12k-9 | | (3x-7)(2x-11)=0 | | 15n=29+2(3n-1 | | 30j+–90j−–39=–81 | | 2(5y+5)=14 | | 2(x-20=10 | | 3x+72=2x+165 | | √x2+3–√=4x⇒3–√x2−4x+3–√=0 | | x+1x=4√3 | | 2x+5=4x-19+ | | 5x-47=3x+83 | | 12b-24=2b | | 12b-8=7b | | 1.2=-16t^2+19t+5 | | 8r-5=11 | | 2x-1/4=-x+1 | | 5y^2-13y+18=0 | | 18/y+5y=13 | | -1/3x+1/15=-2/5x | | -1/2x-5+1/5-3x=5x-3/4-1.5+1/2x | | -1/2x-5+1/5-3x=5x-3/4-11/2+1/2x | | (2.5x4.5)=14x | | 2.5x4.5=14x | | –99+x=–149 | | 11(x+6)=99 | | 6(u-6)=-5u+30 | | n^2-5n+48=0 | | 6(u-6)=5u+30 | | 5(3x+20)=400 | | 8x−11=4x+5 | | x²+0.6x+0.09=1 | | 2d/3=5/8 |