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)
(3/4)*x-12 = 4*x-31 // - 4*x-31
(3/4)*x-(4*x)-12+31 = 0
(3/4)*x-4*x-12+31 = 0
19-13/4*x = 0 // - 19
-13/4*x = -19 // : -13/4
x = -19/(-13/4)
x = 76/13
x = 76/13
| -4(x)-31=y | | 1/2(3/5x-1)=x-5 | | -x/-x | | 3/4(x)-12=y | | 3/4x-12=y | | 30=5+x | | -3(x-b)-(5a-x)=a+b | | 5x+3y+1=0 | | (3a-1)(a+3)=0 | | 4a+4x-3x+3a=0 | | 4x-3x=0+a | | 30=3(v+5)-8v | | w+5/6=42/3 | | 3x+y=29 | | 18-2n=6 | | s-4p=20 | | 5/3+1/2(-2/3)-3/2 | | 2-7x-5=13-3x | | 5lnx+8=14 | | 1/6x+9=21 | | 3d+2=-15 | | y+1=-8/9x+12 | | 4m-8+10-7m= | | 8y^2+6y-5=0 | | 2c-x=4x+c-5b | | 5x+a=3x+b | | 1/2(5/3)-3/2 | | 72x^4-18x^3=0 | | -5/4x=-1/2 | | 4(5p)(p-3)=0 | | 7x-16=2(2x-5) | | 8-12=-12n+8 |