3/4-(х+1/20)=1/5
(3/4)-х-(1/20)=1/5
-х=-1/2
х=1/2
х=0,5
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3/4-(х+1/20)=1/5
(3/4)-х-(1/20)=1/5
-х=-1/2
х=1/2
х=0,5
x+1/20=3/4-1/5
x+1/20=11/20
x=11/20-1/20
x=10/20=1/2=0,5