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a in (-oo:+oo)
(-4*a)/5-3 = 7 // - 7
(-4*a)/5-7-3 = 0
-4/5*a-10 = 0 // + 10
-4/5*a = 10 // : -4/5
a = 10/(-4/5)
a = -25/2
a = -25/2
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