.40+120=100+x

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Solution for .40+120=100+x equation: 



.40+120=100+x

We move all terms to the left:

.40+120-(100+x)=0

We add all the numbers together, and all the variables

-(x+100)+.40+120=0

We add all the numbers together, and all the variables

-(x+100)+120.4=0

We get rid of parentheses

-x-100+120.4=0

We add all the numbers together, and all the variables

-1x+20.4=0

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

-x=-20.4

x=-20.4/-1

x=20+0.4/1

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