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8.4+2x-5x-2.1=-14.4
We move all terms to the left:
8.4+2x-5x-2.1-(-14.4)=0
We add all the numbers together, and all the variables
-3x+20.7=0
We move all terms containing x to the left, all other terms to the right
-3x=-20.7
x=-20.7/-3
x=6+2.7/3
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