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x in (-oo:+oo)
(1/5)*x-((1/3)*x)-4 = 0
(1/5)*x+(-1/3)*x-4 = 0
-2/15*x-4 = 0 // + 4
-2/15*x = 4 // : -2/15
x = 4/(-2/15)
x = -30
x = -30
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