Question

15 + 5m = 415

Can you help me find m?

Answer 1

All you have to do is isolate m. We have to move all terms except m to the other side.

15 + 5m = 415

We have to cancel out the numbers. 15 is being added so we subtract it from both sides.

15 - 15 + 5m = 415 - 15

5m = 400

5 is being multiplied so we divide it on both sides.

5m/5 = 400/5
m = 80

We can plug in to prove.

15 + 5(80) = 415

15 + 400 = 415

415 = 415