4=0.3x-0.4x-5

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Solution for 4=0.3x-0.4x-5 equation: 



4=0.3x-0.4x-5

We move all terms to the left:

4-(0.3x-0.4x-5)=0

We add all the numbers together, and all the variables

-(-0.1x-5)+4=0

We get rid of parentheses

0.1x+5+4=0

We add all the numbers together, and all the variables

0.1x+9=0

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

0.1x=-9

x=-9/0.1

x=-90

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