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x in (-oo:+oo)
(2/5)*x-9 = (4/7)*x-(318/35) // - (4/7)*x-(318/35)
(2/5)*x-((4/7)*x)+318/35-9 = 0
(2/5)*x+(-4/7)*x+318/35-9 = 0
3/35-6/35*x = 0 // - 3/35
-6/35*x = -3/35 // : -6/35
x = -3/35/(-6/35)
x = 1/2
x = 1/2
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