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x in (-oo:+oo)
(2/3)*x-((5/7)*x)-1/3 = -2/7 // + -2/7
(2/3)*x-((5/7)*x)-1/3-(-2/7) = 0
(-5/7)*x+(2/3)*x-1/3+2/7 = 0
-1/21*x-1/21 = 0 // + 1/21
-1/21*x = 1/21 // : -1/21
x = 1/21/(-1/21)
x = -1
x = -1
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