0.4-x=0.2x+1.9

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Solution for 0.4-x=0.2x+1.9 equation: 



0.4-x=0.2x+1.9

We move all terms to the left:

0.4-x-(0.2x+1.9)=0

We add all the numbers together, and all the variables

-1x-(0.2x+1.9)+0.4=0

We get rid of parentheses

-1x-0.2x-1.9+0.4=0

We add all the numbers together, and all the variables

-1.2x-1.5=0

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

-1.2x=1.5

x=1.5/-1.2

x=-1+0.3/1.2

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