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a in (-oo:+oo)
4*a+11/3 = 16*a // - 16*a
4*a-(16*a)+11/3 = 0
4*a-16*a+11/3 = 0
(4-16)*a+11/3 = 0 // - 11/3
(4-16)*a = -11/3 // : 4-16
a = -11/3/(4-16)
a = -11/3/(4-16)
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