(2\frac{1}{2}:0,5*3,8-x):(\frac{1}{2}*0,6+0,8:\frac{3}{4})=0
(2,5:0,5*3,8-x):(0,5*0,6+\frac{4}{5}:\frac{3}{4})=0
(19-x):(0,3+\frac{4}{5}*\frac{4}{3})=0
(19-x):(0,3+\frac{16}{15})=0
(19-x):(\frac{3}{10}+\frac{16}{15})=0
(19-x):(\frac{9}{30}+\frac{32}{30})=0
(19-x):(\frac{41}{30})=0
(19-x)*(\frac{30}{41})=0
(19-x)*30=0
570-30x=0
-30x=-570
x=19
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