If it's not what You are looking for type in the equation solver your own equation and let us solve it.
f in (-oo:+oo)
f = 240/20 // - 240/20
f-(240/20) = 0
f-12 = 0
f-12 = 0 // + 12
f = 12
f = 12
| 2d-8=5+5(d+4) | | u+12=5 | | 6p^2-5p-4=0 | | 24x-36=54 | | 22+t=36 | | v+15=6 | | 5.3n-4.3n-7.9=-1.2 | | 4x-16y=48 | | -2-3b-6=9+b-1+3b | | 20y-19y+10=-22 | | 22+x=36 | | 4+4x=x-8 | | y=1/2x+1(4,2) | | 8u(4u-1)-12u=11(2u-6) | | 2sin^2x-sinx=0 | | 14v+-14v=10 | | -7-2x=x-1+3 | | 32ax+8y=31ax-7y | | 9(8-u)=3 | | 3m+4m=-5 | | 13n-12n-21=17 | | 5/2x+2-17=0 | | 3(70)+20=210+20 | | U+8=11 | | 4=7r | | 2(5-2x)=20-2(x-1) | | 24-a=-12 | | 8(4ax+y)=31ax-7y | | n+27=8(2n-6) | | 4=16-8k | | 25n-24n=-6+3 | | -7+8[5-3(4+6)]= |