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2z+-5=4z+91
We move all terms to the left:
2z+-5-(4z+91)=0
We add all the numbers together, and all the variables
2z-(4z+91)=0
We get rid of parentheses
2z-4z-91=0
We add all the numbers together, and all the variables
-2z-91=0
We move all terms containing z to the left, all other terms to the right
-2z=91
z=91/-2
z=-45+1/2
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