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)
(-1/4)*(12*x-16) = (1/3)*(21*x+6) // - (1/3)*(21*x+6)
(-1/4)*(12*x-16)-((1/3)*(21*x+6)) = 0
(-1/4)*(12*x-16)+(-1/3)*(21*x+6) = 0
-1/4*(12*x-16)-1/3*(21*x+6) = 0
-1/4*(12*x-16)-1/3*(21*x+6) = 0
2-10*x = 0
2-10*x = 0
2-10*x = 0 // - 2
-10*x = -2 // : -10
x = -2/(-10)
x = 1/5
x = 1/5
| X+5+2X=15 | | 3k-6+5k=4k+4k+6 | | 10xsquared+2x-7=0 | | 10=x+(x*5) | | -3x+18+13=19 | | 5-(1+6v)=3v+7(-4v+6) | | 10=x+(x+5) | | -2x+1/2y=18 | | 6(x-1)-2x=38 | | 9-(-4z-5)=1-5z | | -75-5*20= | | 1/10y-6=16 | | 6(x+7)-20=6x+2 | | -39.2=7.2-11.6x | | x-7/2x^2-32 | | 14+21= | | -5x+5(7x-5)=-175 | | 15-2x+5x=30 | | 21+14= | | -3(4+2x)=18 | | 8x-40=120 | | 5x+2x-3=-3x+1x | | 5w+3x=24 | | 1500+5/3x=x | | 4x^2-19x+11=-3x+4 | | -(12-8x)=84 | | 22p+11=15-7 | | 7x-7(5x+9)=133 | | 4n+n=2n+6 | | z-3/2=7 | | 563/10=-18/5(11/4n-1/2)-n | | x+10+14x-58=9x |