n= -15
n+(-7)-n=
Your second line makes no sense. n-7-n=-7
n+(-7)-n=
-15 + (-7) + 15 = -7
To simplify the given expression, let's break it down step by step.
Step 1: Write down the expression.
n + (-7) - n
Step 2: Simplify the expression by combining like terms.
In this case, the two terms with 'n' will cancel each other out because they have opposite signs. So, you are left with (-7).
Step 3: Final answer.
The expression simplified to -7.