If it's not what You are looking for type in the equation solver your own equation and let us solve it.
a in (-oo:+oo)
2/3 = a/42 // - a/42
2/3-(a/42) = 0
2/3-1/42*a = 0 // - 2/3
-1/42*a = -2/3 // : -1/42
a = -2/3/(-1/42)
a = 28
a = 28
| Cosx/secx | | -6w+3(w+8)=-3 | | 8x-5=2x+6 | | 10z-16=2z+8 | | Lnx=250 | | 3(2-3y)=15 | | 3(2-3)=15 | | (25x+30)+(5x)= | | x+11=0.75x-9 | | 126+84+x=360 | | 696=4(x+19) | | -a/b=1 | | Ln(2x+8)=56 | | 2/3x-1=5/2 | | t^2+10t-100=0 | | 3(7-2x)=39 | | 5(16-4x^2)^3/5 | | (16-4x^2)^3/5 | | 127+90+x=360 | | 6-x=20+6x | | 2(x-1)-3(2x+1)=5 | | -12(6x+5)= | | 5=4v+v | | 5=4v-v | | 150+80+40+90=160 | | -5/-9= | | 3x-1+4x+1+3x=70 | | 5y-6=7y+26 | | 17u-14u=93 | | 4(v+12)-11=-3 | | 3z/7-5=-1 | | x*.35=100000 |