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x in (-oo:+oo)
8/5 = (12/2)*x+4 // - (12/2)*x+4
8/5-((12/2)*x)-4 = 0
8/5-6*x-4 = 0
-6*x-12/5 = 0 // + 12/5
-6*x = 12/5 // : -6
x = 12/5/(-6)
x = -2/5
x = -2/5
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