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70=10(z-85)
We move all terms to the left:
70-(10(z-85))=0
We calculate terms in parentheses: -(10(z-85)), so:We get rid of parentheses
10(z-85)
We multiply parentheses
10z-850
Back to the equation:
-(10z-850)
-10z+850+70=0
We add all the numbers together, and all the variables
-10z+920=0
We move all terms containing z to the left, all other terms to the right
-10z=-920
z=-920/-10
z=+92
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