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180=3z+(2z+6)+(2z+6)
We move all terms to the left:
180-(3z+(2z+6)+(2z+6))=0
We calculate terms in parentheses: -(3z+(2z+6)+(2z+6)), so:We get rid of parentheses
3z+(2z+6)+(2z+6)
We get rid of parentheses
3z+2z+2z+6+6
We add all the numbers together, and all the variables
7z+12
Back to the equation:
-(7z+12)
-7z-12+180=0
We add all the numbers together, and all the variables
-7z+168=0
We move all terms containing z to the left, all other terms to the right
-7z=-168
z=-168/-7
z=+24
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