If it's not what You are looking for type in the equation solver your own equation and let us solve it.
3+12x=0
We move all terms containing x to the left, all other terms to the right
12x=-3
x=-3/12
x=-1/4
| -2/9x+19=-17 | | 15x+30=25x | | 12+5q=8q-3 | | (Y+-7)(y+9)=0 | | 4(x^2+4x+2x+8)=12x | | 25^x-4=125 | | 12+9=4w | | 4x^2=-2.67 | | 4=10−2j | | -3x2=-6 | | 6a-25=8a+12 | | 7-5÷x=-1 | | X-24=y=90 | | 10x-3=6+10 | | 4^2t=8^t+1 | | 7-x+4=9x | | 5x-90=360 | | x2+7x=-4 | | 7-x÷5=-1 | | 54=6-8d | | 8.1x=137.7 | | 2-3q+1=10-q-1 | | 3x^2−33x+54=0 | | 4x-3-7x-3=6x+6 | | 10-x÷3=-9 | | 5x-90=180 | | -8x-2=5x+11 | | 2/3x-4x+8/3=4/3 | | -8+2x=-4x-26 | | 3w−1=2 | | x-$407.59=$60.69 | | 8.25=x+0.2x |