In the
linear algebraic equation x + 15 = 10, to
solve for variable 'x', we need to get 'x' by itself on one side of the equation
We need to remove 15. Here, 15 is having a plus sign. So when we shift 15 on the RHS, its sign will reverse.
We will
subtract 15 from both sides.

Here, 10 is having a plus sign and 15 is having a minus sign.
In mathematics, when numbers have opposite signs, they are always subtracted and sign present on bigger number will prevail.
Here, subtracting 15 with 10 gives us 5. The number 15 is having a minus sign. So, the answer 5 will have a minus sign.
The solution is complete.