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