If it's not what You are looking for type in the equation solver your own equation and let us solve it.
x in (-oo:+oo)
3*x+12/3 = 0
3*x+4 = 0 // - 4
3*x = -4 // : 3
x = -4/3
x = -4/3
| 2z+-4+z=4 | | 3t-15+5t=-9 | | 11(x+21)+-6=-6 | | y-0=-1/5(x-4) | | 2w^2+3w-54= | | 4(r+24)+9=17 | | 500.00+0.35g=1342.50g | | 500.00+0.35g=1342.50 | | -p+3p-(-p)=183 | | 42-x/4=12-x | | 0=-1/2(-3)+b | | 5(x-2)-4x=7-3(2x+1) | | 42x/12x=4 | | -11n+16=-7n-8 | | 42/12=x | | 42/12= | | 27-12=5(x-1) | | 6x-4=7x+7 | | 42-x/12-x=4 | | 42-30=x | | x^2+12x=-16 | | 2a/3+7=15 | | 42-x-30=4 | | 42x-12x=4 | | 6X+68/8=-2 | | y-(-12)=-2(x-11) | | 2X+4/9=-4 | | (21/2)(13/5)-23/8 | | 21/2x13/5-23/8 | | 6X+55/7=-5 | | 4X+48/6=-2 | | y=-1/5x+1/9 |