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)
5 = a/18 // - a/18
5-(a/18) = 0
5-1/18*a = 0 // - 5
-1/18*a = -5 // : -1/18
a = -5/(-1/18)
a = 90
a = 90
| 0=-6x^2+5x+6 | | 10x=54 | | 27-x=3x-84 | | 1/4(7x-12) | | x+9(3.4)=-25 | | 6x-15y=0 | | 7(-25+9y)-4y=26 | | x+9y=-25 | | 5x+30=12-26 | | 32x-6=21x-70 | | x2=1200000/0.004 | | x+7=2x(x-7) | | 0.1x+.09(-8000)=-7 | | 66-2x=3x | | 0=-x^2-x+6 | | 4x+2=3(x-5)+6 | | 0=-x+3 | | 0.4(-70+.09y)-.04y=4 | | 0.1x+.09y=-7 | | x+7=2x-7 | | 3x+8=188 | | 9x-15=84 | | 79-6x=10x | | 15x+2=5x+56 | | 15x-10(-1/5)=5 | | 98=6x+4x+8 | | 11+32y-3y^2=0 | | 15y=-5+10(1/3+2/3y) | | ln(y)=8t+4 | | (6x-3)/5=x+1 | | -9+4x=-1 | | 6x-3/5=x+1 |