Answer:
a = 16
Explanation:
The key to solving for a variable is to get that variable by itself.
We want to end up with the form "a = something," and to do that we need to "undo" all the things that are acting on 'a'.
"Minus 7" is acting on a, so to "undo" that we need to add 7 to both sides of the equation:
a/2 = 8
Always do those plus or minus things first.
Now we see that a is being divided by 2, so to undo that we need to multiply by 2 on both sides:
a = 16 And we're done.
But always check your work. Plug 16 into the equation and make sure it works:
16/2 - 7 = 1 --> 8 - 7 = 1 is true, so our answer is correct.