90=70+0.4x

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Solution for 90=70+0.4x equation: 



90=70+0.4x

We move all terms to the left:

90-(70+0.4x)=0

We add all the numbers together, and all the variables

-(0.4x+70)+90=0

We get rid of parentheses

-0.4x-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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