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x in (-oo:+oo)
(1/7)*x+3/5-(1/3) = (6/7)*x // - (6/7)*x
(1/7)*x-((6/7)*x)+3/5-(1/3) = 0
(1/7)*x+(-6/7)*x+3/5-1/3 = 0
4/15-5/7*x = 0 // - 4/15
-5/7*x = -4/15 // : -5/7
x = -4/15/(-5/7)
x = 28/75
x = 28/75
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