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x in (-oo:+oo)
(2/5)*x-6 = (3/5)*x-14 // - (3/5)*x-14
(2/5)*x-((3/5)*x)-6+14 = 0
(2/5)*x+(-3/5)*x-6+14 = 0
8-1/5*x = 0 // - 8
-1/5*x = -8 // : -1/5
x = -8/(-1/5)
x = 40
x = 40
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