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39/2 = 3*x-((1/2)*x)-8 // - 3*x-((1/2)*x)-8
(1/2)*x-(3*x)+39/2+8 = 0
(1/2)*x-3*x+39/2+8 = 0
55/2-5/2*x = 0 // - 55/2
-5/2*x = -55/2 // : -5/2
x = -55/2/(-5/2)
x = 11
x = 11
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