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x in (-oo:+oo)
(1/7)*x-((5/7)*x) = 1 // - 1
(1/7)*x-((5/7)*x)-1 = 0
(1/7)*x+(-5/7)*x-1 = 0
-4/7*x-1 = 0 // + 1
-4/7*x = 1 // : -4/7
x = 1/(-4/7)
x = -7/4
x = -7/4
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