40=40-0.8x

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Solution for 40=40-0.8x equation: 



40=40-0.8x

We move all terms to the left:

40-(40-0.8x)=0

We add all the numbers together, and all the variables

-(-0.8x+40)+40=0

We get rid of parentheses

0.8x-40+40=0

We add all the numbers together, and all the variables

0.8x=0

x=0/0.8

x=0

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