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)
21/2-((25*x)/12) = 0
(-25/12)*x+21/2 = 0
21/2-25/12*x = 0 // - 21/2
-25/12*x = -21/2 // : -25/12
x = -21/2/(-25/12)
x = 126/25
x = 126/25
| 0=6x^2-5x-4 | | 4(2y-1)=5(3y+1) | | 3/2*-1/6=-7/6x-1/6 | | x=6x-24 | | ax^2+(x-1)=(x+1)a | | 1/2(6x-10)=31 | | 3(2x-1)+10(x+2)=56x+36 | | 3x-2=1x+6 | | .02(50)+.03r=.04(50+r) | | 14(-1)/(-7)+(7-6(11)) | | 8x-10=10x-20 | | x^3+4x^2-2x-3=0 | | (5x^2+19x+10)/(x+3)=0 | | x+5/3=3x+2/6 | | .09k+.13(k+3000)=61 | | 5/6=-2/3n | | 5m-2=3m+4 | | 7x*(-1)= | | 102=5-3x | | 10A+6B+C=40 | | 14+3=8n-3(n-4) | | 4(b-59)=64 | | c-98/-1=-1 | | 3A+5B+2C=300 | | -17y-25y= | | 2(d-9)+6= | | 3(z+1)+10=28 | | -4=88-f | | 3/5w-1/5w+10=4 | | -1x-4=32 | | 8(p-87)+14=94 | | 90x+2x+30=180 |