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4(1-z)=2(z-7)
We move all terms to the left:
4(1-z)-(2(z-7))=0
We add all the numbers together, and all the variables
4(-1z+1)-(2(z-7))=0
We multiply parentheses
-4z-(2(z-7))+4=0
We calculate terms in parentheses: -(2(z-7)), so:We get rid of parentheses
2(z-7)
We multiply parentheses
2z-14
Back to the equation:
-(2z-14)
-4z-2z+14+4=0
We add all the numbers together, and all the variables
-6z+18=0
We move all terms containing z to the left, all other terms to the right
-6z=-18
z=-18/-6
z=+3
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