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(a+2)/2=-1
We simplify the equation to the form, which is simple to understand
(a+2)/2=-1
Reorder the terms in parentheses
( + 0.5a+1)=-1
Remove unnecessary parentheses
+ 0.5a+1=-1
We move all terms containing a to the left and all other terms to the right.
+ 0.5a=-1-1
We simplify left and right side of the equation.
+ 0.5a=-2
We divide both sides of the equation by 0.5 to get a.
a=-4
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