70+.8x=20+.9x

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Solution for 70+.8x=20+.9x equation: 



70+.8x=20+.9x

We move all terms to the left:

70+.8x-(20+.9x)=0

We add all the numbers together, and all the variables

.8x-(.9x+20)+70=0

We get rid of parentheses

.8x-.9x-20+70=0

We add all the numbers together, and all the variables

-0.1x+50=0

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

-0.1x=-50

x=-50/-0.1

x=+500

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