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4-y/2=72
We move all terms to the left:
4-y/2-(72)=0
We add all the numbers together, and all the variables
-y/2-68=0
We multiply all the terms by the denominator
-y-68*2=0
We add all the numbers together, and all the variables
-1y-136=0
We move all terms containing y to the left, all other terms to the right
-y=136
y=136/-1
y=-136
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