If it's not what You are looking for type in the equation solver your own equation and let us solve it.
15x+12x=100
We move all terms to the left:
15x+12x-(100)=0
We add all the numbers together, and all the variables
27x-100=0
We move all terms containing x to the left, all other terms to the right
27x=100
x=100/27
x=3+19/27
| 3x/2+2=2x-291/4 | | 4-1d=-(d-4) | | 5z=17-12 | | -3c-c=-5+12 | | 5x-3+2(x+22)=90 | | 22.5x-4x^2=0 | | 9y+4=3y+6 | | 5r2+-2=0 | | -7x-15=-19 | | x+30=2(2x+3) | | 6x13=8 | | -(x-22)=x+4 | | x/5-16=18 | | 2(x+7)=2(3x+25) | | X/x/5=72 | | 6-6x=6x+2 | | -2(x+1)=x+1 | | 6.8g+5=2.9g+17 | | x+1=-(2x-1) | | 6x+27=8.5x | | 3v+7=-9v+49 | | x-13=5(x+3) | | x+4=-2(x-5) | | 1/7x2/7x-20=-25 | | (1/2)(x^2)(10)+10x-120=0 | | 2+x=-15+7/8 | | 10m=750 | | 5x-7+3x+13=180 | | x+15=3(x+1) | | 15x15=x | | 9/12x-4/12=4/12 | | X+87+x+4=180 |