-6+(2+1)=(-6+2)+1

Solution for -6+(2+1)=(-6+2)+1 equation:

-6+(2+1)=(-6+2)+1

We simplify the equation to the form, which is simple to understand 
-6+(2+1)=(-6+2)+1

Simplifying terms in parentheses
-6+(+3)=(-6+2)+1

Simplifying terms in parentheses
-6+(+3)=(-4)+1

Remove unnecessary parentheses
-6+3=+(-4+)+1

Remove unnecessary parentheses
-6+3=-4+1

We move all terms containing  to the left and all other terms to the right. 
0=-4+1+6-3

We simplify left and right side of the equation. 
0=0

0=0

This equation is an identity, so all real numbers are solutions.