40=20+0.4*x

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Solution for 40=20+0.4*x equation: 



40=20+0.4x

We move all terms to the left:

40-(20+0.4x)=0

We add all the numbers together, and all the variables

-(0.4x+20)+40=0

We get rid of parentheses

-0.4x-20+40=0

We add all the numbers together, and all the variables

-0.4x+20=0

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

-0.4x=-20

x=-20/-0.4

x=+50

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