how do you get an answer when there is a number with a variable on both side with a number

Question

I don't know this is the question 5n+10=3n

Answer 1

Algebra!

5n+10=3n

Subtract 3n from both sides:

2n + 10 = 0

Subtract 10 from both sides:

2n = -10

Divide both sides by 2:

n = -5