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a in (-oo:+oo)
(3*a)/16 = 7*a-4 // - 7*a-4
(3*a)/16-(7*a)+4 = 0
(3*a)/16-7*a+4 = 0
4-109/16*a = 0 // - 4
-109/16*a = -4 // : -109/16
a = -4/(-109/16)
a = 64/109
a = 64/109
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