The answer depends on the equation: there is no single method which can be used for all equations.
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Subtraction is the addition of a negative number.
0 is the identity
In the same wasy as you solve equations except that if you multiply or divide both sides by a negative number, then the inequality changes direction.
here is subtraction problem... 9 - 4 = 5 here is an addition of the opposite 9 + -4 = 5 both these equations are true and mean the same thing. when you subtracted you are actually adding the negative of that number. the negative means to put a minus symbol in front of that number and that number is the amount of units it takes from below zero to get to zero.
Addition and subtraction can be thought of as the same thing because subtracting a negative number is the same as adding it and adding a negative number is the same as subtracting it.