To solve the equation short dash 2 x plus 5 equals 9 for x, what operations must be performed on both sides of the equation in order to isolate the variable x? a.) Multiplying by 2 then subtracting 5 b.) Dividing by -2 then subtracting 9 c.) Adding 5 then dividing by 9 d.) Subtracting 5 then dividing by -2