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x in (-oo:+oo)
(1/5)*x-(2/3) = (7/5)*x-(3/5) // - (7/5)*x-(3/5)
(1/5)*x-((7/5)*x)-(2/3)+3/5 = 0
(1/5)*x+(-7/5)*x-2/3+3/5 = 0
-6/5*x-1/15 = 0 // + 1/15
-6/5*x = 1/15 // : -6/5
x = 1/15/(-6/5)
x = -1/18
x = -1/18
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