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x in (-oo:+oo)
6 = 5*x+12/8 // - 5*x+12/8
6-(5*x)-(12/8) = 0
6-5*x-3/2 = 0
9/2-5*x = 0 // - 9/2
-5*x = -9/2 // : -5
x = -9/2/(-5)
x = 9/10
x = 9/10
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