4.2-x=5

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Solution for 4.2-x=5 equation: 



4.2-x=5

We move all terms to the left:

4.2-x-(5)=0

We add all the numbers together, and all the variables

-1x-0.8=0

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

-x=0.8

x=0.8/-1

x=-0.8/1

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