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15+2z=43-5z
We move all terms to the left:
15+2z-(43-5z)=0
We add all the numbers together, and all the variables
2z-(-5z+43)+15=0
We get rid of parentheses
2z+5z-43+15=0
We add all the numbers together, and all the variables
7z-28=0
We move all terms containing z to the left, all other terms to the right
7z=28
z=28/7
z=4
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