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-1(a+3)=-1(a+1)-2
We simplify the equation to the form, which is simple to understand
-1(a+3)=-1(a+1)-2
Reorder the terms in parentheses
+(-1a-3)=-1*(a+1)-2
Remove unnecessary parentheses
-1a-3=-1+*(+a+1+)-2
Reorder the terms in parentheses
-1a-3=+(-1a-1)-2
Remove unnecessary parentheses
-1a-3=-1a-1-2
We move all terms containing a to the left and all other terms to the right.
-1a+1a=-1-2+3
We simplify left and right side of the equation.
a=0
0=0
This equation is an identity, so all real numbers are solutions.
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