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x in (-oo:+oo)
(19/30)*x+4 = (27/30)*x // - (27/30)*x
(19/30)*x-((27/30)*x)+4 = 0
(19/30)*x+(-9/10)*x+4 = 0
4-4/15*x = 0 // - 4
-4/15*x = -4 // : -4/15
x = -4/(-4/15)
x = 15
x = 15
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