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4z/10+4=9
We move all terms to the left:
4z/10+4-(9)=0
We add all the numbers together, and all the variables
4z/10-5=0
We multiply all the terms by the denominator
4z-5*10=0
We add all the numbers together, and all the variables
4z-50=0
We move all terms containing z to the left, all other terms to the right
4z=50
z=50/4
z=12+1/2
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