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a in (-oo:+oo)
2*(8-3*a) = 4 // - 4
2*(8-3*a)-4 = 0
2*(8-3*a)-4 = 0
12-6*a = 0
12-6*a = 0
12-6*a = 0 // - 12
-6*a = -12 // : -6
a = -12/(-6)
a = 2
a = 2
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