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a in (-oo:+oo)
-a-((5/2)*a) = 35/4 // - 35/4
-a-((5/2)*a)-(35/4) = 0
(-5/2)*a-a-35/4 = 0
-7/2*a-35/4 = 0 // + 35/4
-7/2*a = 35/4 // : -7/2
a = 35/4/(-7/2)
a = -5/2
a = -5/2
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