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3z/10+5=7
We move all terms to the left:
3z/10+5-(7)=0
We add all the numbers together, and all the variables
3z/10-2=0
We multiply all the terms by the denominator
3z-2*10=0
We add all the numbers together, and all the variables
3z-20=0
We move all terms containing z to the left, all other terms to the right
3z=20
z=20/3
z=6+2/3
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