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7.2-3.5x=5.5
We move all terms to the left:
7.2-3.5x-(5.5)=0
We add all the numbers together, and all the variables
-3.5x+1.7=0
We move all terms containing x to the left, all other terms to the right
-3.5x=-1.7
x=-1.7/-3.5
x=1/2.0588235294118
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