40+.9x=80+.7x

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Solution for 40+.9x=80+.7x equation: 



40+.9x=80+.7x

We move all terms to the left:

40+.9x-(80+.7x)=0

We add all the numbers together, and all the variables

.9x-(.7x+80)+40=0

We get rid of parentheses

.9x-.7x-80+40=0

We add all the numbers together, and all the variables

0.2x-40=0

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

0.2x=40

x=40/0.2

x=200

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