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4z*9-7=2
We move all terms to the left:
4z*9-7-(2)=0
We add all the numbers together, and all the variables
4z*9-9=0
Wy multiply elements
36z-9=0
We move all terms containing z to the left, all other terms to the right
36z=9
z=9/36
z=1/4
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