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7x-5.4=12.1
We move all terms to the left:
7x-5.4-(12.1)=0
We add all the numbers together, and all the variables
7x-17.5=0
We move all terms containing x to the left, all other terms to the right
7x=17.5
x=17.5/7
x=2+2.3333333333333/4.6666666666667
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