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x in (-oo:+oo)
(3/10)*x-12 = (9/25)*x // - (9/25)*x
(3/10)*x-((9/25)*x)-12 = 0
(3/10)*x+(-9/25)*x-12 = 0
-3/50*x-12 = 0 // + 12
-3/50*x = 12 // : -3/50
x = 12/(-3/50)
x = -200
x = -200
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