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First, you have to have the unknown variable, for it has only one variable to solve.
Second, isolate the ones without the given variable to be solved; remember to change signs(transpose the unnecessary ones)
Then, if you could, combine some of it like constants and variables.
Lastly, if the variable is with a numeral coefficient, divide it thorough the coefficient.
Example: 2y + 3 = 12    y = ?

0 0 0
Actually you can choose either you will use the substitution or elimination, in substitution, you must assume 1st that a variable x=0 or any nonnegative real numbers, then substitute.
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