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5(z-3)=7
We move all terms to the left:
5(z-3)-(7)=0
We multiply parentheses
5z-15-7=0
We add all the numbers together, and all the variables
5z-22=0
We move all terms containing z to the left, all other terms to the right
5z=22
z=22/5
z=4+2/5
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