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2z+4(2z+3)=15
We move all terms to the left:
2z+4(2z+3)-(15)=0
We multiply parentheses
2z+8z+12-15=0
We add all the numbers together, and all the variables
10z-3=0
We move all terms containing z to the left, all other terms to the right
10z=3
z=3/10
z=3/10
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