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45=z/3
We move all terms to the left:
45-(z/3)=0
We add all the numbers together, and all the variables
-(+z/3)+45=0
We get rid of parentheses
-z/3+45=0
We multiply all the terms by the denominator
-z+45*3=0
We add all the numbers together, and all the variables
-1z+135=0
We move all terms containing z to the left, all other terms to the right
-z=-135
z=-135/-1
z=+135
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