-8.3=x+4.2

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Solution for -8.3=x+4.2 equation: 



-8.3=x+4.2

We move all terms to the left:

-8.3-(x+4.2)=0

We get rid of parentheses

-x-4.2-8.3=0

We add all the numbers together, and all the variables

-1x-12.5=0

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

-x=12.5

x=12.5/-1

x=-12+0.5/1

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