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(-8z+4)+(8z-7)=87z
We move all terms to the left:
(-8z+4)+(8z-7)-(87z)=0
We add all the numbers together, and all the variables
-87z+(-8z+4)+(8z-7)=0
We get rid of parentheses
-87z-8z+8z+4-7=0
We add all the numbers together, and all the variables
-87z-3=0
We move all terms containing z to the left, all other terms to the right
-87z=3
z=3/-87
z=-1/29
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