I don't understand the equation, please someone explain me how to resolve.

#12 find the value of x. #13 find the value of the variable.

Tom had a total of $220 and he spent $35 on a basketball ticket . what percent of his money did he have left?

This is a rational expression because the denominator contains a variable. this is a polynomial with 3 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 4 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 4 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 3 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 5 terms.