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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-2.6=0
We move all terms containing x to the left, all other terms to the right
8.1x=2.6
x=2.6/8.1
x=1/3.1153846153846
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