Question

What is n? -4n - 5 = -3n + 4

Answer 1

Move n terms on one side and other terms on the other side. Note that by moving we are essentially subtracting and adding to both sides so the prefix of a term changes from - to + or from + to -.

$-4n-5=-3n+4 \\-4n+3n=4+5 \\-n=9 \\n=-9$

Hope this helps.