12-(x+3)=21

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Solution for 12-(x+3)=21 equation:


12-(x+3)=21

We simplify the equation to the form, which is simple to understand 
12-(x+3)=21

Remove unnecessary parentheses
12-1x-3=21

We move all terms containing x to the left and all other terms to the right. 
-1x=+21-12+3

We simplify left and right side of the equation. 
-1x=+12

We divide both sides of the equation by -1 to get x. 
x=-12

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