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a in (-oo:+oo)
-(3*a)-(2*a)-8 = 37 // - 37
-(3*a)-(2*a)-37-8 = 0
-3*a-2*a-37-8 = 0
-5*a-45 = 0 // + 45
-5*a = 45 // : -5
a = 45/(-5)
a = -9
a = -9
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