3x-5=10
why?
To solve, find x.
3 * x(?) - 5 = 10
What minus 5 equals 10?
15.
So multiply 5 * 3 and finish: 3 * 5 - 5 = 10
3 * 5 = 15
15 - 5 = 10
Therefore: x = 5, 5 = x
