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8=3+z/2
We move all terms to the left:
8-(3+z/2)=0
We add all the numbers together, and all the variables
-(z/2+3)+8=0
We get rid of parentheses
-z/2-3+8=0
We multiply all the terms by the denominator
-z-3*2+8*2=0
We add all the numbers together, and all the variables
-1z+10=0
We move all terms containing z to the left, all other terms to the right
-z=-10
z=-10/-1
z=+10
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