Add 9 to both sides: To isolate the variable n, we need to get n on one side of the equation by itself. We can do this by adding 9 to both sides of the equation to cancel out the −9 that is added to n. −10=n+(−9) Add 9 to both sides: −10+9=n+(−9)+9
Simplify both sides: Now, we simplify both sides of the equation. −10+9=n+0−1=n
Isolate and find n: We have isolated n and found its value.n=−1