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4.7+8.4x-21.9=6.7x+21.2-3.1x
We move all terms to the left:
4.7+8.4x-21.9-(6.7x+21.2-3.1x)=0
We add all the numbers together, and all the variables
8.4x-(3.6x+21.2)+4.7-21.9=0
We add all the numbers together, and all the variables
8.4x-(3.6x+21.2)-17.2=0
We get rid of parentheses
8.4x-3.6x-21.2-17.2=0
We add all the numbers together, and all the variables
4.8x-38.4=0
We move all terms containing x to the left, all other terms to the right
4.8x=38.4
x=38.4/4.8
x=8
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