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-3z+7-(4z-5)=7z+4
We move all terms to the left:
-3z+7-(4z-5)-(7z+4)=0
We get rid of parentheses
-3z-4z-7z+5-4+7=0
We add all the numbers together, and all the variables
-14z+8=0
We move all terms containing z to the left, all other terms to the right
-14z=-8
z=-8/-14
z=4/7
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