120+.7x=20+.9x

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Solution for 120+.7x=20+.9x equation: 



120+.7x=20+.9x

We move all terms to the left:

120+.7x-(20+.9x)=0

We add all the numbers together, and all the variables

.7x-(.9x+20)+120=0

We get rid of parentheses

.7x-.9x-20+120=0

We add all the numbers together, and all the variables

-0.2x+100=0

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

-0.2x=-100

x=-100/-0.2

x=+500

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