40=0.3x+4x

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Solution for 40=0.3x+4x equation: 



40=0.3x+4x

We move all terms to the left:

40-(0.3x+4x)=0

We add all the numbers together, and all the variables

-(+4.3x)+40=0

We get rid of parentheses

-4.3x+40=0

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

-4.3x=-40

x=-40/-4.3

x=9+1/3.3076923076923

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