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14=-7(z-3)
We move all terms to the left:
14-(-7(z-3))=0
We calculate terms in parentheses: -(-7(z-3)), so:We get rid of parentheses
-7(z-3)
We multiply parentheses
-7z+21
Back to the equation:
-(-7z+21)
7z-21+14=0
We add all the numbers together, and all the variables
7z-7=0
We move all terms containing z to the left, all other terms to the right
7z=7
z=7/7
z=1
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