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a in (-oo:+oo)
4*(-a-(3/3)) = 2 // - 2
4*(-a-(3/3))-2 = 0
4*(-a-1)-2 = 0
4*(-a-1)-2 = 0
-4*a-6 = 0
-4*a-6 = 0
-4*a-6 = 0 // + 6
-4*a = 6 // : -4
a = 6/(-4)
a = -3/2
a = -3/2
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