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x in (-oo:+oo)
(1/5)*x-((7/3)*x) = 1 // - 1
(1/5)*x-((7/3)*x)-1 = 0
(1/5)*x+(-7/3)*x-1 = 0
-32/15*x-1 = 0 // + 1
-32/15*x = 1 // : -32/15
x = 1/(-32/15)
x = -15/32
x = -15/32
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