solve for x&y if 2/x+3/y=2 , 1/x-1/2y=1/3
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let 1/x=a 1/y=b
2a+3b=2
a-2b=3
2a+3b=2
2a-4b=1/6.
- + -
7b=11/6
b=11/42
a-2(11/42)=3
a-11/21=3
a=3+11/21=63+11/21=84/21
x=21/84. y=42/11
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