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(z/2.5)+12=18
We move all terms to the left:
(z/2.5)+12-(18)=0
We add all the numbers together, and all the variables
(+z/2.5)+12-18=0
We add all the numbers together, and all the variables
(+z/2.5)-6=0
We get rid of parentheses
z/2.5-6=0
We multiply all the terms by the denominator
z-6*2.5=0
We add all the numbers together, and all the variables
z-15=0
We move all terms containing z to the left, all other terms to the right
z=15
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