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)
(2/5)*x = (3/7)*x // - (3/7)*x
(2/5)*x-((3/7)*x) = 0
(2/5)*x+(-3/7)*x = 0
-1/35*x = 0 // : -1/35
x = 0
x = 0
| -3x+2=8x+28 | | (a^3+7a+3)+(5a^3-9)= | | 3m^2(10+m)=0 | | 6=9u-11u-6 | | x^100/5 | | -2(4b+1)-13=5(2b+3)-3b | | 10x^2+3x-9+2x-10x^2+2= | | 8x+7=6x+2 | | rt-2=fg+2 | | 14-5/8b=3 | | se=x | | ab+cd+p=12 | | y^2-144=o | | 5m+20=5 | | 7m+6=7 | | 5x+33=-2x-44 | | f+7=mn-2 | | g(17)=3 | | np=bd+rt | | 3x+32=11x-32# | | 66=3m+6 | | X-4/8=5x-5/3 | | 10(s-5)=-153 | | (3x-2)-(x+1)=x+(2x+3) | | y=x-2a | | x=10(6/5) | | 15=5a+6b | | -4a-4b=0 | | gh=w | | x-5=12(x-11) | | -2x-7=21 | | a-b=k |