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x in (-oo:+oo)
(1/7)*x-((2/3)*x) = 1 // - 1
(1/7)*x-((2/3)*x)-1 = 0
(1/7)*x+(-2/3)*x-1 = 0
-11/21*x-1 = 0 // + 1
-11/21*x = 1 // : -11/21
x = 1/(-11/21)
x = -21/11
x = -21/11
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