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-4(z-87)=-40
We move all terms to the left:
-4(z-87)-(-40)=0
We add all the numbers together, and all the variables
-4(z-87)+40=0
We multiply parentheses
-4z+348+40=0
We add all the numbers together, and all the variables
-4z+388=0
We move all terms containing z to the left, all other terms to the right
-4z=-388
z=-388/-4
z=+97
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