70+.40x=20+.90x

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



70+.40x=20+.90x

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

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

We add all the numbers together, and all the variables

-0.5x+50=0

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

-0.5x=-50

x=-50/-0.5

x=+100

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