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x in (-oo:+oo)
(1/7)*x-5 = (3/5)*x-((3/7)*x) // - (3/5)*x-((3/7)*x)
(1/7)*x-((3/5)*x)+(3/7)*x-5 = 0
(1/7)*x+(-3/5)*x+(3/7)*x-5 = 0
-1/35*x-5 = 0 // + 5
-1/35*x = 5 // : -1/35
x = 5/(-1/35)
x = -175
x = -175
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