120+.50x=80+.90x

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Solution for 120+.50x=80+.90x equation: 



120+.50x=80+.90x

We move all terms to the left:

120+.50x-(80+.90x)=0

We add all the numbers together, and all the variables

.50x-(.90x+80)+120=0

We get rid of parentheses

.50x-.90x-80+120=0

We add all the numbers together, and all the variables

-0.4x+40=0

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

-0.4x=-40

x=-40/-0.4

x=+100

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