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(180-x)/2=39
We move all terms to the left:
(180-x)/2-(39)=0
We add all the numbers together, and all the variables
(-1x+180)/2-39=0
We multiply all the terms by the denominator
(-1x+180)-39*2=0
We add all the numbers together, and all the variables
(-1x+180)-78=0
We get rid of parentheses
-1x+180-78=0
We add all the numbers together, and all the variables
-1x+102=0
We move all terms containing x to the left, all other terms to the right
-x=-102
x=-102/-1
x=+102
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