If it's not what You are looking for type in the equation solver your own equation and let us solve it.
b in (-oo:+oo)
1/2-(4*b)-(2*b) = 25/2 // - 25/2
1/2-(4*b)-(2*b)-(25/2) = 0
1/2-4*b-2*b-25/2 = 0
-6*b-12 = 0 // + 12
-6*b = 12 // : -6
b = 12/(-6)
b = -2
b = -2
| a+7+1/3a=15 | | -a+1+1/2a=5/7 | | 125/63=-1/2k+6/7k+5/9 | | 32/3=x+7x+8 | | 10-1/2x+2x=43/4 | | x-4+3x=-2/3 | | -3/5a+7-4a=54/11 | | 4-6/7n-3n=271/7 | | 8/21=-1/7k+2/3k+5/7 | | 7+3/4m+4m=47/4 | | 2/3+4w+4/7w=1166/21 | | 2/5w+10+4/7w=3082/315 | | 3/5-b+7b=-327/5 | | -n-3/7+n=-3/7 | | -64/11=-4k+k-5 | | 5n-8+6n=-34/7 | | 39=6a-2a-1 | | -1+2n-1/2n=3/8 | | 4+4k+k=44 | | 35-x=0 | | 35*x=0 | | 3/7-1/2b+4b=24/7 | | -1+3/4b+5/6b=-34/15 | | 3/7m+10+3/4m=73/4 | | 6a+7+a=14/3 | | 5/9+2/3x+5x=49/27 | | 1/3-6t-6t=73/3 | | 2b+5+b=17 | | -5/8=-3a-2/3a+3/8 | | 3/56=-4d+7d+3/7 | | 3=5t+5/7t-2 | | n-10+n=-2 |