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x in (-oo:+oo)
(3/5)*x-1 = (6/7)*x-73/70 // - (6/7)*x-73/70
(3/5)*x-((6/7)*x)-(-73/70)-1 = 0
(3/5)*x+(-6/7)*x+73/70-1 = 0
3/70-9/35*x = 0 // - 3/70
-9/35*x = -3/70 // : -9/35
x = -3/70/(-9/35)
x = 1/6
x = 1/6
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