Ответ:
a) x+1/5=4/10
x+1/5=2/5
x=2/5-1/5
x=1/5
б) 6/15-y=1/4
2/5-y=1/4
-y=1/4-2/5
-y=-3/20
y=3/20
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Ответ:
a) x+1/5=4/10
x+1/5=2/5
x=2/5-1/5
x=1/5
б) 6/15-y=1/4
2/5-y=1/4
-y=1/4-2/5
-y=-3/20
y=3/20