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104.4+21x=180
We move all terms to the left:
104.4+21x-(180)=0
We add all the numbers together, and all the variables
21x-75.6=0
We move all terms containing x to the left, all other terms to the right
21x=75.6
x=75.6/21
x=3+3.5/5.83333333333
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