When you are solving for m you want to seclude m on one side,
So start by subtracting 7 on both sides because you want to use inverse operations so since it’s positive use negative
2m = 2
Now since you use inverse operations you want the m by itself to since 2m is bound through multiplication use division so divide 2 on both sides and you’re left with
m = 1
You can check by filling m back into the equation
2(1) + 7 = 9
2 + 7 = 9
9 = 9
So it’s true