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8+12z=4(2+3)
We move all terms to the left:
8+12z-(4(2+3))=0
We add all the numbers together, and all the variables
12z+8-(45)=0
We add all the numbers together, and all the variables
12z-37=0
We move all terms containing z to the left, all other terms to the right
12z=37
z=37/12
z=3+1/12
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