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)
15-12 = x/(-5) // - x/(-5)
15-(x/(-5))-12 = 0
1/5*x+3 = 0 // - 3
1/5*x = -3 // : 1/5
x = -3/1/5
x = -15
x = -15
| 60x+120=90x | | 4sinx^1/2 | | 6x1/5 | | 0=-16t^2+96t-2500 | | .1(x-6)+.5=1-.4(12-2x)-.5 | | 5b*9b= | | 11z=-44 | | A-8(42)=650 | | (-6/7)x*42 | | 2x+3y=16.50 | | 0=-16t^2+96t+2500 | | 5i/(3-i) | | 3/4a-1/4 | | 28a=3a+5 | | -2=27g | | -8*s= | | (5x/6)-x=(x/54)-(8/9) | | 0=-16t^2+146t+20 | | 5x^2+2x^2y+y^2=8 | | 2s*2= | | (-7x^3y^-2)^-3/(x^2y)^2 | | 2x(64-x^2)^(1/2)-x=0 | | 250-8x=650 | | 3x+2y=130 | | -35=-c/6 | | 6y=-2x-3 | | 2s*s= | | 0=-16t^2+146t-20 | | 2s+s= | | 0.6+1.5=3.9 | | -4c=-16 | | 0/7= |