40+.9x=100+.8x

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Solution for 40+.9x=100+.8x equation: 



40+.9x=100+.8x

We move all terms to the left:

40+.9x-(100+.8x)=0

We add all the numbers together, and all the variables

.9x-(.8x+100)+40=0

We get rid of parentheses

.9x-.8x-100+40=0

We add all the numbers together, and all the variables

0.1x-60=0

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

0.1x=60

x=60/0.1

x=600

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