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20=-2(-6-2z)
We move all terms to the left:
20-(-2(-6-2z))=0
We add all the numbers together, and all the variables
-(-2(-2z-6))+20=0
We calculate terms in parentheses: -(-2(-2z-6)), so:We get rid of parentheses
-2(-2z-6)
We multiply parentheses
4z+12
Back to the equation:
-(4z+12)
-4z-12+20=0
We add all the numbers together, and all the variables
-4z+8=0
We move all terms containing z to the left, all other terms to the right
-4z=-8
z=-8/-4
z=+2
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