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x in (-oo:+oo)
8 = 5*(1/2)*x-4 // - 5*(1/2)*x-4
4-(5*(1/2)*x)+8 = 0
(-5/2)*x+4+8 = 0
12-5/2*x = 0 // - 12
-5/2*x = -12 // : -5/2
x = -12/(-5/2)
x = 24/5
x = 24/5
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