Question: NULL response. Correction needed.

Why does this code return NULL? Which, earlier than 2017 version of Maple differs? What other Maple function could be used in place of eliminate for the general case?

 

eliminate({x[5] = x[2] / x[1], x[6] = x[3] / x[2], x[7] = x[1] / x[4], x[8] = (2 * x[2] + x[4]) / (2 * x[1] + x[3] + x[4])}, {x[1], x[2], x[3], x[4], x[8]});

 

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