4*5=40-x

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Solution for 4*5=40-x equation: 



4*5=40-x

We move all terms to the left:

4*5-(40-x)=0

We add all the numbers together, and all the variables

-(-1x+40)+4*5=0

We add all the numbers together, and all the variables

-(-1x+40)+20=0

We get rid of parentheses

1x-40+20=0

We add all the numbers together, and all the variables

x-20=0

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

x=20

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