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5(2z+3)=45
We move all terms to the left:
5(2z+3)-(45)=0
We multiply parentheses
10z+15-45=0
We add all the numbers together, and all the variables
10z-30=0
We move all terms containing z to the left, all other terms to the right
10z=30
z=30/10
z=3
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