1=0.4x-0.9x-19

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Solution for 1=0.4x-0.9x-19 equation: 



1=0.4x-0.9x-19

We move all terms to the left:

1-(0.4x-0.9x-19)=0

We add all the numbers together, and all the variables

-(-0.5x-19)+1=0

We get rid of parentheses

0.5x+19+1=0

We add all the numbers together, and all the variables

0.5x+20=0

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

0.5x=-20

x=-20/0.5

x=-40

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