-4.2x=8.4

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Solution for -4.2x=8.4 equation: 



-4.2x=8.4

We move all terms to the left:

-4.2x-(8.4)=0

We add all the numbers together, and all the variables

-4.2x-8.4=0

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

-4.2x=8.4

x=8.4/-4.2

x=-2

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