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7x-12.6=2.1
We move all terms to the left:
7x-12.6-(2.1)=0
We add all the numbers together, and all the variables
7x-14.7=0
We move all terms containing x to the left, all other terms to the right
7x=14.7
x=14.7/7
x=2+0.7/7
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