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a in (-oo:+oo)
-(4*a)-(6*a)-3 = -53 // + 53
53-(4*a)-(6*a)-3 = 0
53-4*a-6*a-3 = 0
50-10*a = 0 // - 50
-10*a = -50 // : -10
a = -50/(-10)
a = 5
a = 5
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