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x in (-oo:+oo)
12 = (5/2)*x-8 // - (5/2)*x-8
8-((5/2)*x)+12 = 0
(-5/2)*x+8+12 = 0
20-5/2*x = 0 // - 20
-5/2*x = -20 // : -5/2
x = -20/(-5/2)
x = 8
x = 8
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