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a in (-oo:+oo)
19 = 3*a+a+3 // - 3*a+a+3
19-(3*a)-a-3 = 0
19-3*a-a-3 = 0
16-4*a = 0 // - 16
-4*a = -16 // : -4
a = -16/(-4)
a = 4
a = 4
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