20=3.5x

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Solution for 20=3.5x equation: 



20=3.5x

We move all terms to the left:

20-(3.5x)=0

We add all the numbers together, and all the variables

-(+3.5x)+20=0

We get rid of parentheses

-3.5x+20=0

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

-3.5x=-20

x=-20/-3.5

x=5+2.5/3.5

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