140=3.5*x

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Solution for 140=3.5*x equation: 



140=3.5x

We move all terms to the left:

140-(3.5x)=0

We add all the numbers together, and all the variables

-(+3.5x)+140=0

We get rid of parentheses

-3.5x+140=0

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

-3.5x=-140

x=-140/-3.5

x=+40

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