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(1/x) - (1/y) = (1/z) Get the left-hand side over a common denominator:- (y-x)/xy = 1/z Take the reciprocal of both sides:- z = xy / (y-x)
x+xy=8 xy=-x+8 y=-1+8/x
It is then x/y when simplified
xy + x + y + 1 is an expression, not an equation. An expression cannot be solved.
If you're solving for x, then x = 3/y.