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-(6+a)=5a+12
We simplify the equation to the form, which is simple to understand
-(6+a)=5a+12
Remove unnecessary parentheses
-6-1a=5a+12
We move all terms containing a to the left and all other terms to the right.
-1a-5a=+12+6
We simplify left and right side of the equation.
-6a=+18
We divide both sides of the equation by -6 to get a.
a=-3
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