X +1/y=5 and 2x+3/y=13 then (2x-3y) is
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x+1 = 5y => x = 5y - 1
2x = 13y - 3
2(5y - 1) = 13y - 3
10y - 2 = 13y - 3
1 = 3y
y = 1/3
x + 1 = 5y
x = 5/3 - 1
x = 2/3
2x - 3y => 2(2/3) - 3(1/3)
=> 4/3 - 1
=> 1/3
hope so it may help you
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