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a in (-oo:+oo)
(3*a)/4 = 36/64 // - 36/64
(3*a)/4-(36/64) = 0
(3*a)/4-9/16 = 0
3/4*a-9/16 = 0 // + 9/16
3/4*a = 9/16 // : 3/4
a = 9/16/3/4
a = 3/4
a = 3/4
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