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)
(30*x-12)/5 = 3*x // - 3*x
(30*x-12)/5-(3*x) = 0
(30*x-12)/5-3*x = 0
(30*x-12)/5+(-3*5*x)/5 = 0
30*x-3*5*x-12 = 0
15*x-12 = 0
(15*x-12)/5 = 0
(15*x-12)/5 = 0 // * 5
15*x-12 = 0
15*x-12 = 0 // + 12
15*x = 12 // : 15
x = 12/15
x = 4/5
x = 4/5
| -2x+3y+10z=22 | | 30x-12/5=3x | | (-6/5)(12/5) | | 2x+20y-2z=-44 | | x^4+5x^3-x^2-16x+100=0 | | 10x+2y+z=9 | | Log(3x-1)=0 | | -8=-(k+4) | | x^4+5x^3-x^2-16x+10=0 | | cos^2x+4cosx=0 | | 3x+48=9 | | 6m+9=62 | | x^2-2xy+y^2+3x-3y+4=0 | | 8915=p*5 | | 2a^2-3ab+2b^2-a-b+1=0 | | -3(6p+2)-2(2-14p)=3(4+3p) | | (7y+7)-(4+6y)=12 | | x^2+5-86=0 | | (7y+5)-(3+6y)=11 | | 14.16/6.82 | | ln5/(3-x) | | ((5/7)/2-1) | | 7=5e^2x | | 6x+1+2x+10=180 | | 6.5+9.5v=x+43.3 | | 28-5y-y=-5 | | y=2(9a+2b) | | 8x-(7x-8)=2x-48 | | 28-10y=-5 | | AC=AB+AB | | 10-5x=6x+8 | | -2.5u=3 |