if a+c=13, a+b=8, c-d=6 and b+d=8 than find the value of a ,b, c, d ?
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Technically, there is no specific answer to your problem. That is because you have 5 variables and only 4 equations. is not now, never has been, and never will be the same thing as . However, presuming that you were simply being sloppy...
a + b = 8 => a = 8 - b
b + d = 8 => d = 8 - b, so the first thing we know is that a = d
a + c = 13 => a = 13 - c
c - d = 6 => d = c - 6
but since a = d
c - 6 = 13 - c => 2c = 19 => c = 9.5
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