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6(9z+5)-8(4z-2)=90
We move all terms to the left:
6(9z+5)-8(4z-2)-(90)=0
We multiply parentheses
54z-32z+30+16-90=0
We add all the numbers together, and all the variables
22z-44=0
We move all terms containing z to the left, all other terms to the right
22z=44
z=44/22
z=2
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