90+.40x=70+.80x

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Solution for 90+.40x=70+.80x equation: 



90+.40x=70+.80x

We move all terms to the left:

90+.40x-(70+.80x)=0

We add all the numbers together, and all the variables

.40x-(.80x+70)+90=0

We get rid of parentheses

.40x-.80x-70+90=0

We add all the numbers together, and all the variables

-0.4x+20=0

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

-0.4x=-20

x=-20/-0.4

x=+50

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