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5(z-5)=5(5z-7)
We move all terms to the left:
5(z-5)-(5(5z-7))=0
We multiply parentheses
5z-(5(5z-7))-25=0
We calculate terms in parentheses: -(5(5z-7)), so:We get rid of parentheses
5(5z-7)
We multiply parentheses
25z-35
Back to the equation:
-(25z-35)
5z-25z+35-25=0
We add all the numbers together, and all the variables
-20z+10=0
We move all terms containing z to the left, all other terms to the right
-20z=-10
z=-10/-20
z=1/2
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