4.2+3.9+5+(x)=21.5

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Solution for 4.2+3.9+5+(x)=21.5 equation: 



4.2+3.9+5+(x)=21.5

We move all terms to the left:

4.2+3.9+5+(x)-(21.5)=0

We add all the numbers together, and all the variables

x-8.4=0

We move all terms containing x to the left, all other terms to the right

x=8.4

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