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)
3-((3/10)*x) = (1/5)*x // - (1/5)*x
3-((3/10)*x)-((1/5)*x) = 0
(-3/10)*x+(-1/5)*x+3 = 0
3-1/2*x = 0 // - 3
-1/2*x = -3 // : -1/2
x = -3/(-1/2)
x = 6
x = 6
| 8x-9+x=3x+6 | | 8t+5x=40 | | 8=-9b+2b | | 2(4x-9)+x=3x+6 | | 14=13y+2y | | 200+4x+0.1x^2=496.4 | | 12(x+3)=4x+20 | | 15-28i=3l(4m)i | | 0.5x+0.06(x-1500)=570 | | x=4x+0.1x^2-296.4 | | -3/15= | | 5k-4=2(4) | | 13(x-5)=5x-11 | | 8a+1.5a*4=200 | | 0.6-4.4=-(3.8y-1) | | 3(6x-2)(6x-1)-(2x-3)(5x+6)= | | 2(x-3*4)-12=2 | | 3(x+1)-6=4x-22 | | 3(x+1)-6=4x-2 | | 2(x+8)=62 | | -6.1y-(3-6y)=-13+13.9y | | 8+2m-5=6m+4-3m | | 3t+19=5+t | | 12=-4x+-8 | | 3a/4-a/3=5/2 | | -26-10.2x=-2(-0.9x+4) | | 5n-6+2n+1=8+5n+1 | | 10x^2-7x-24=0 | | 11(x+8)=7x+9 | | 1-9x+2=1-4x+8-11x | | 4x+11=2x+17 | | 12x+4=7x+18 |