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3*x+x/2 = 4*x+4/5-3 // - 4*x+4/5-3
3*x+x/2-(4*x)-(4/5)+3 = 0
3*x+x/2-4*x-4/5+3 = 0
11/5-1/2*x = 0 // - 11/5
-1/2*x = -11/5 // : -1/2
x = -11/5/(-1/2)
x = 22/5
x = 22/5
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