No
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4xy + x3y + yx2 + yx + 3yx = x3y + x2y + 8xy = (xy)(x2y + x + 8)
xy over yx can be simplified to 1. 2x over 2y can be simplified to x over y. So the final step would be to simplify 1 divided by x over y, which would just be 1 multiplied by y over x. Answer: y/x (y over x)
This equation does not equal a number, but it can be factorised. x2-xy-20y2=(x-5y)(x+4y)
That is irrelevant, there is not possible way y=xy, and there is no possible way xy=x.
xy=70000 x+y=550 Solve.