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5(6z-1)-5(z+9)=21(z+1)
We move all terms to the left:
5(6z-1)-5(z+9)-(21(z+1))=0
We multiply parentheses
30z-5z-(21(z+1))-5-45=0
We calculate terms in parentheses: -(21(z+1)), so:We add all the numbers together, and all the variables
21(z+1)
We multiply parentheses
21z+21
Back to the equation:
-(21z+21)
25z-(21z+21)-50=0
We get rid of parentheses
25z-21z-21-50=0
We add all the numbers together, and all the variables
4z-71=0
We move all terms containing z to the left, all other terms to the right
4z=71
z=71/4
z=17+3/4
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