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a in (-oo:+oo)
(5*a)/4 = 6*a-76 // - 6*a-76
(5*a)/4-(6*a)+76 = 0
(5*a)/4-6*a+76 = 0
76-19/4*a = 0 // - 76
-19/4*a = -76 // : -19/4
a = -76/(-19/4)
a = 16
a = 16
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