100-3x=40

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Solution for 100-3x=40 equation: 



100-3x=40

We move all terms to the left:

100-3x-(40)=0

We add all the numbers together, and all the variables

-3x+60=0

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

-3x=-60

x=-60/-3

x=+20

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