Most people just stop using 'x' for multiply so it doesn't get confused with the variable x.
So you can just write 4Y = 20.
That means 4 times y equals 20.
Some people write 4 * y = 20. The * also means multiply.
It just keeps it less confusing to NOT use x because we use x as a variable so often, and you can have a term with MULTIPLE variables, so 4xy could easily be a term in an equation.