1. 2/5+X=11/15
X=11/15-2/5 `3
X= (11-6)/15
X= 5/15= 1/3
2. a+3/14=8/21
a= 8/21`14-3/14`21
a= (112-63)/294=49/294
3. X-7/8=5/12
X=5/12`2+7/8`6
X=(10+42)/48=52/48=13/12
4. 5/6-a=3/22
-a=3/22`6-5/6`22
-a=(18-110)/132
a=92/132
5. 4/9-y=2/15
-y=2/15`9-4/9`15
-y=(18-60)/135=-42/135
y=42/135
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Answers & Comments
1. 2/5+X=11/15
X=11/15-2/5 `3
X= (11-6)/15
X= 5/15= 1/3
2. a+3/14=8/21
a= 8/21`14-3/14`21
a= (112-63)/294=49/294
3. X-7/8=5/12
X=5/12`2+7/8`6
X=(10+42)/48=52/48=13/12
4. 5/6-a=3/22
-a=3/22`6-5/6`22
-a=(18-110)/132
a=92/132
5. 4/9-y=2/15
-y=2/15`9-4/9`15
-y=(18-60)/135=-42/135
y=42/135