70+.40x=30+.90x

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Solution for 70+.40x=30+.90x equation: 



70+.40x=30+.90x

We move all terms to the left:

70+.40x-(30+.90x)=0

We add all the numbers together, and all the variables

.40x-(.90x+30)+70=0

We get rid of parentheses

.40x-.90x-30+70=0

We add all the numbers together, and all the variables

-0.5x+40=0

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

-0.5x=-40

x=-40/-0.5

x=+80

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