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