-3n-(-9)=-12

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Solution for -3n-(-9)=-12 equation:


-3n-(-9)=-12

We simplify the equation to the form, which is simple to understand 
-3n-(-9)=-12

Remove unnecessary parentheses
-3n+9=-12

We move all terms containing n to the left and all other terms to the right. 
-3n=-12-9

We simplify left and right side of the equation. 
-3n=-21

We divide both sides of the equation by -3 to get n. 
n=7

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