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2.1-3x=16
We move all terms to the left:
2.1-3x-(16)=0
We add all the numbers together, and all the variables
-3x-13.9=0
We move all terms containing x to the left, all other terms to the right
-3x=13.9
x=13.9/-3
x=-4+1/1.5789473684211
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