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a in (-oo:+oo)
-6*a-(3/4) = 261/4 // - 261/4
-6*a-(3/4)-(261/4) = 0
-6*a-3/4-261/4 = 0
-6*a-66 = 0 // + 66
-6*a = 66 // : -6
a = 66/(-6)
a = -11
a = -11
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