That depends on what the fractions, variables, and numbers are, on what the equation
says, and on what you're asked to find. There's no general rule that's useful in every
case. Sadly, there's no other choice but to use your brain every time.
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It is a ratio.
algebra involves equations with numbers a variables and your goal is to solve for the variable
variables that allows us to preform equations with numbers.
Two equations are equal when the result of the functions of the numbers and variables of one equation match the results of the other equation.
The idea is to work with the same variables, but it is possible that some of the variables are missing in some of the equations.