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x in (-oo:+oo)
12/5-(3*x) = 4 // - 4
12/5-(3*x)-4 = 0
12/5-3*x-4 = 0
-3*x-8/5 = 0 // + 8/5
-3*x = 8/5 // : -3
x = 8/5/(-3)
x = -8/15
x = -8/15
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