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a in (-oo:+oo)
9/5-((7/2)*a) = 0
(-7/2)*a+9/5 = 0
9/5-7/2*a = 0 // - 9/5
-7/2*a = -9/5 // : -7/2
a = -9/5/(-7/2)
a = 18/35
a = 18/35
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