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x in (-oo:+oo)
(1/6)*x-((7/15)*x) = 2/5 // - 2/5
(1/6)*x-((7/15)*x)-(2/5) = 0
(1/6)*x+(-7/15)*x-2/5 = 0
-3/10*x-2/5 = 0 // + 2/5
-3/10*x = 2/5 // : -3/10
x = 2/5/(-3/10)
x = -4/3
x = -4/3
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