My sister is 14 years old. my brother says that his age minus twelve is equal to my sisters age. how old is my brother ** explain**

Hey there!
First, we must identify that our unknown is the brother's - and we must create an equation since it says "equals to".
If we assign b to brother's age, we have:

14 (sister's age) is equal to: b - 12 (brother's age minus 12)
=
14 = b-12

Add 12 to both sides:

26 = b

To check:

14 = 26-12

14 = 14

Therefore, the brother is 26.

Hope this helps!