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(-1/2)*x+3 = (4/5)*x+201/80 // - (4/5)*x+201/80
(-1/2)*x-((4/5)*x)-(201/80)+3 = 0
(-1/2)*x+(-4/5)*x-201/80+3 = 0
39/80-13/10*x = 0 // - 39/80
-13/10*x = -39/80 // : -13/10
x = -39/80/(-13/10)
x = 3/8
x = 3/8
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