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x in (-oo:+oo)
-12 = (4/3)*x // - (4/3)*x
-((4/3)*x)-12 = 0
(-4/3)*x-12 = 0
-4/3*x-12 = 0 // + 12
-4/3*x = 12 // : -4/3
x = 12/(-4/3)
x = -9
x = -9
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