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)
(7*x)/b-((5*x)/c) = a // - a
(7*x)/b-a-((5*x)/c) = 0
(7*x)/b-a-5*c^-1*x = 0
-a-5*c^-1*x = 0 // + a
-5*c^-1*x = a // : -5*c^-1
x = a/(-5*c^-1)
x = a/(-5*c^-1)
| (-6)=-4(-6)-9 | | X+(6.4)= | | 10/80×100= | | -(-2x-5)=3x+5 | | 18/80×100= | | (-6)=-4x-9 | | 5n+9*3=-n+11 | | x-10z=0 | | 6w+5(w-2)=4 | | X+25+4x=-22-4x-25 | | x+13y=-45 | | 9f*2=10f+80 | | (5x-20)=90 | | X+0.75= | | -3(-1-5a)=-117 | | 2x^2+k+1=0 | | 3(x+2)-5=4(3x+5)-3x | | u+20+u-38=180 | | 10x-x^2=8+2x | | a(2x-6)=b-18x | | 4r+4(r+4)=392 | | (3)=-4(3)-9 | | 40-t=8-2t | | 3(x+1)=x+7 | | 2x^2+12x+18=90 | | 1r+11-3r=15+2r | | -2x^2-x-0.12=0 | | 5+0.25*100=x | | 65+195x=1820 | | -4(-3x+4)-5x=-65 | | 6a^2+12a-72=-6 | | X-7=4x-13 |