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-(a+3)=2(2a+1)-7
We simplify the equation to the form, which is simple to understand
-(a+3)=2(2a+1)-7
Remove unnecessary parentheses
-1a-3=2*(2a+1)-7
Reorder the terms in parentheses
-1a-3=+(+4a+2)-7
Remove unnecessary parentheses
-1a-3=+4a+2-7
We move all terms containing a to the left and all other terms to the right.
-1a-4a=+2-7+3
We simplify left and right side of the equation.
-5a=-2
We divide both sides of the equation by -5 to get a.
a=0.4
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