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4=z-(-12)
We move all terms to the left:
4-(z-(-12))=0
We calculate terms in parentheses: -(z-(-12)), so:We get rid of parentheses
z-(-12)
We add all the numbers together, and all the variables
z+12
Back to the equation:
-(z+12)
-z-12+4=0
We add all the numbers together, and all the variables
-1z-8=0
We move all terms containing z to the left, all other terms to the right
-z=8
z=8/-1
z=-8
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