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17.7x-4.2x=89.2
We move all terms to the left:
17.7x-4.2x-(89.2)=0
We add all the numbers together, and all the variables
13.5x-89.2=0
We move all terms containing x to the left, all other terms to the right
13.5x=89.2
x=89.2/13.5
x=6+6.8333333333333/11.25
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