Question
$$xx\cdot\frac{3}{4}x\cdot\frac{5}{7}x\cdot1715 = 735$$
Answer
This equation has no solution.
Explanation
$$ \begin{aligned} xx\cdot\frac{3}{4}x\cdot\frac{5}{7}x\cdot1715 &= 735&& \text{multiply ALL terms by } \color{blue}{ 28 }. \\[1 em]28xx\cdot\frac{3}{4}x\cdot\frac{5}{7}x\cdot1715 &= 28\cdot735&& \text{cancel out the denominators} \\[1 em]25725x^4 &= 20580&& \text{move all terms to the left hand side } \\[1 em]25725x^4-20580 &= 0&& \\[1 em] \end{aligned} $$
This polynomial has no rational roots that can be found using Rational Root Test.
Roots were found using quartic formulas
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Equations Solver