If it's not what You are looking for type in the equation solver your own equation and let us solve it.
b in (-oo:+oo)
12 = (3-b)/12 // - (3-b)/12
12-((3-b)/12) = 0
(-1*(3-b))/12+12 = 0
(-1*(3-b))/12+(12^2)/12 = 0
144-1*(3-b) = 0
b+141 = 0
(b+141)/12 = 0
(b+141)/12 = 0 // * 12
b+141 = 0
b+141 = 0 // - 141
b = -141
b = -141
| 5X+2Y=16 X-3Y=10 | | 9-6x=x-33 | | 3x-4y+2z=8 | | 5/y=15 | | 128=4z | | -3(3x-42)=2(70-52) | | 14-5x/3 | | x+(x*3)=900 | | 2x+1=5x-1 | | r/50=8 | | 6x^3-11x^2-63=0 | | 5x+3=20x-1 | | 8x-63=-4 | | 11x+10=3x-10 | | 0=-16t^2+24t+144 | | 8x-6=-4 | | 3(5y+2)+6y= | | 6x^2+7x-45=0 | | 3x+5x=-5+x | | 11x+10=3(x-10) | | 7x+4y-3x+8y+c= | | 1.14(85)+0.72= | | -2u-7/3=2/3u-7/5 | | 1.14(15)+0.72= | | 6m-3m+3m=3m-3m+12 | | 9x+5=11x-35 | | 1.05(25)+2.5= | | 7z-2=10 | | 0.33*75+0.66*60=M | | 70.75=1.05F+2.5 | | 28.75=1.05F+2.5 | | X^2-2x+10=6x+3 |