Question

how do we remove the extra variable from one side??
e.g
2n = n - 1

how do we remove the variable next to the -1

Answer 1

By transposing the variable from RHS to LHS

2n=n-1

2n-n=-1

n=-1

Answer 2

2n=n-1

2n-n=-1

n=-1

I hope this answer helps you with your test and/or homework