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a in (-oo:+oo)
16 = (3*a)/4 // - (3*a)/4
16-((3*a)/4) = 0
(-3/4)*a+16 = 0
16-3/4*a = 0 // - 16
-3/4*a = -16 // : -3/4
a = -16/(-3/4)
a = 64/3
a = 64/3
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