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a in (-oo:+oo)
-16 = 5*a-3*a+2 // - 5*a-3*a+2
-(-3*a)-(5*a)-16-2 = 0
3*a-5*a-16-2 = 0
-2*a-18 = 0 // + 18
-2*a = 18 // : -2
a = 18/(-2)
a = -9
a = -9
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