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a in (-oo:+oo)
-(5*a)-2 = 2*a+47 // - 2*a+47
-(5*a)-(2*a)-47-2 = 0
-5*a-2*a-47-2 = 0
-7*a-49 = 0 // + 49
-7*a = 49 // : -7
a = 49/(-7)
a = -7
a = -7
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