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56=-7(-4-2z)
We move all terms to the left:
56-(-7(-4-2z))=0
We add all the numbers together, and all the variables
-(-7(-2z-4))+56=0
We calculate terms in parentheses: -(-7(-2z-4)), so:We get rid of parentheses
-7(-2z-4)
We multiply parentheses
14z+28
Back to the equation:
-(14z+28)
-14z-28+56=0
We add all the numbers together, and all the variables
-14z+28=0
We move all terms containing z to the left, all other terms to the right
-14z=-28
z=-28/-14
z=+2
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