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-60=-2(5z-5)
We move all terms to the left:
-60-(-2(5z-5))=0
We calculate terms in parentheses: -(-2(5z-5)), so:We get rid of parentheses
-2(5z-5)
We multiply parentheses
-10z+10
Back to the equation:
-(-10z+10)
10z-10-60=0
We add all the numbers together, and all the variables
10z-70=0
We move all terms containing z to the left, all other terms to the right
10z=70
z=70/10
z=7
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