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a in (-oo:+oo)
7/5-((9/2)*a) = 0
(-9/2)*a+7/5 = 0
7/5-9/2*a = 0 // - 7/5
-9/2*a = -7/5 // : -9/2
a = -7/5/(-9/2)
a = 14/45
a = 14/45
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