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x in (-oo:+oo)
-48 = 12-((4/3)*x) // - 12-((4/3)*x)
(4/3)*x-48-12 = 0
4/3*x-60 = 0 // + 60
4/3*x = 60 // : 4/3
x = 60/4/3
x = 45
x = 45
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