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a in (-oo:+oo)
9/4 = (3*a)/29 // - (3*a)/29
9/4-((3*a)/29) = 0
(-3/29)*a+9/4 = 0
9/4-3/29*a = 0 // - 9/4
-3/29*a = -9/4 // : -3/29
a = -9/4/(-3/29)
a = 87/4
a = 87/4
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