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