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a in (-oo:+oo)
a+3/4 = 3*a+51/4 // - 3*a+51/4
a-(3*a)+3/4-(51/4) = 0
a-3*a+3/4-51/4 = 0
-2*a-12 = 0 // + 12
-2*a = 12 // : -2
a = 12/(-2)
a = -6
a = -6
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