X+(-15)=30

To solve the equation \( x + (-15) = 30 \), you can simplify it by rewriting it as:

\[ x - 15 = 30 \]

Next, to isolate \( x \), add 15 to both sides of the equation:

\[ x - 15 + 15 = 30 + 15 \]

This simplifies to:

\[ x = 45 \]

So the solution is:

\[ x = 45 \]