100+.4x=80+.5x

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Solution for 100+.4x=80+.5x equation: 



100+.4x=80+.5x

We move all terms to the left:

100+.4x-(80+.5x)=0

We add all the numbers together, and all the variables

.4x-(.5x+80)+100=0

We get rid of parentheses

.4x-.5x-80+100=0

We add all the numbers together, and all the variables

-0.1x+20=0

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

-0.1x=-20

x=-20/-0.1

x=+200

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