90-3x=180

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Solution for 90-3x=180 equation: 



90-3x=180

We move all terms to the left:

90-3x-(180)=0

We add all the numbers together, and all the variables

-3x-90=0

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

-3x=90

x=90/-3

x=-30

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