the fraction is percent over 100 and fraction over the whole. Whatever number is missing you multiply across in an X with the end being the empty space.
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There appears to be no equation in the question: only some disjoint expressions. Expressions cannot be solved.
You solve the equation the same way as you would any other equation. Whether the variable is a fraction or otherwise will only become clear once you solve the equation. In other words, you don't initially KNOW whether the solution will be a fraction or not.
An equation or an inequality can be solved but an expression cannot be solved.
Some expressions can't be factorised, and you have to use other methods to solve the equation.
The question contains an expression: not an equation or inequality. Expressions cannot be solved.