90-4x=80-3.5x

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Solution for 90-4x=80-3.5x equation: 



90-4x=80-3.5x

We move all terms to the left:

90-4x-(80-3.5x)=0

We add all the numbers together, and all the variables

-4x-(-3.5x+80)+90=0

We get rid of parentheses

-4x+3.5x-80+90=0

We add all the numbers together, and all the variables

-0.5x+10=0

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

-0.5x=-10

x=-10/-0.5

x=+20

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