100+.50x=80+.90x

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Solution for 100+.50x=80+.90x equation: 



100+.50x=80+.90x

We move all terms to the left:

100+.50x-(80+.90x)=0

We add all the numbers together, and all the variables

.50x-(.90x+80)+100=0

We get rid of parentheses

.50x-.90x-80+100=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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