40+.70x=20+.90x

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Solution for 40+.70x=20+.90x equation: 



40+.70x=20+.90x

We move all terms to the left:

40+.70x-(20+.90x)=0

We add all the numbers together, and all the variables

.70x-(.90x+20)+40=0

We get rid of parentheses

.70x-.90x-20+40=0

We add all the numbers together, and all the variables

-0.2x+20=0

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

-0.2x=-20

x=-20/-0.2

x=+100

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