If it's not what You are looking for type in the equation solver your own equation and let us solve it.
d in (-oo:+oo)
(15-d)/12 = 37.5/75 // - 37.5/75
(15-d)/12-(37.5/75) = 0
(15-d)/12-0.5 = 0
(15-d)/12+(-0.5*12)/12 = 0
15-d-0.5*12 = 0
9-d = 0
(9-d)/12 = 0
(9-d)/12 = 0 // * 12
9-d = 0
9-d = 0 // - 9
-d = -9 // * -1
d = 9
d = 9
| 2+8x^2+8x=9x^2 | | 6-2y-6(-3y+7)ify=3 | | 3(2/8) | | (2+3y)(4x+5y)= | | 5.285-3.5x=0 | | m/9-9=-18 | | 5.285-3.25x=0 | | y(y)+14y+13=0 | | X+.5+.25=2.75 | | 7c(5-2c^2+c^3)= | | x-(x*(20/100))=120 | | .75-x=10.45 | | 9m-3=6 | | 3(2y+4)=12y-12 | | 1.4n=2n+3.2 | | 8y=24-6x | | m=n-p/r-5 | | X+.4=.7 | | 7U=12 | | 1.4(-2)=2(-2)+3.2 | | 4a^2+52a-120=0 | | -16t(t)+8t-8=0 | | 66*6= | | 4*(3*1)=5y+66 | | 5/8n=1/4 | | 3x^2+2y^2+12x-4y+8=0 | | 19.40+0.75(450-100)= | | 11+5x=4x+20 | | x-.875=.25 | | 5x+5-6(x+1)=3x-1 | | 100-[(8*5)+20]=40 | | 7/(7x) |