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7.1x-4+x=1.4
We move all terms to the left:
7.1x-4+x-(1.4)=0
We add all the numbers together, and all the variables
8.1x-5.4=0
We move all terms containing x to the left, all other terms to the right
8.1x=5.4
x=5.4/8.1
x=3.8571428571429/5.7857142857143
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