If it's not what You are looking for type in the equation solver your own equation and let us solve it.
n in (-oo:+oo)
(3/4)*n+3/5 = 57/70 // - 57/70
(3/4)*n+3/5-(57/70) = 0
(3/4)*n+3/5-57/70 = 0
3/4*n-3/14 = 0 // + 3/14
3/4*n = 3/14 // : 3/4
n = 3/14/3/4
n = 2/7
n = 2/7
| t+5=-3 | | 8-1/4b=29/4 | | -1/6k+5/6=29/42 | | 5/7+d=-9/7 | | .9(5x+15)=2.8-(x+3) | | -b-1=-11/7 | | 7b+2=-19 | | 7/8+4b=295/8 | | 1+6n=43 | | 3/4m+1/10=47/20 | | 10-7w=27/2 | | 1/3+6m=163/3 | | (x^5y^4)1/2 | | -3/10+2k=-3/10 | | 1/4+7b=57/4 | | 4/5m+2/3=13/15 | | 8(k+1)+3(12-2k)=6k-4-6k | | -1/2b+1/3=-8/3 | | 5k+1/2=23/6 | | 2/3t-1=-14/9 | | y=x^3+2x^2-3x-3 | | 6b+8=64/5 | | 10-7k=6 | | -7x-8=55 | | 7+3m=53/8 | | y=x^3+2x-3x-3 | | 5b-2/9=493/9 | | -1/2a-1/2=-1/4 | | 6b+1=-35 | | 2/3a+3=83/33 | | 3/5-4/5b=17/55 | | 3/5t+1=13/10 |