-3+(-9)=-18

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Solution for -3+(-9)=-18 equation:


-3+(-9)=-18

We simplify the equation to the form, which is simple to understand 
-3+(-9)=-18

Remove unnecessary parentheses
-3-9=-18

We move all terms containing  to the left and all other terms to the right. 
0=-18+3+9

We simplify left and right side of the equation. 
0=-6

0=-6

The left and right sides are not equal, therefore there is no solution. This equation is invalid.

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