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0=-2(z-10)
We move all terms to the left:
0-(-2(z-10))=0
We add all the numbers together, and all the variables
-(-2(z-10))=0
We calculate terms in parentheses: -(-2(z-10)), so:We get rid of parentheses
-2(z-10)
We multiply parentheses
-2z+20
Back to the equation:
-(-2z+20)
2z-20=0
We move all terms containing z to the left, all other terms to the right
2z=20
z=20/2
z=10
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