20+151+90=3x

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Solution for 20+151+90=3x equation: 



20+151+90=3x

We move all terms to the left:

20+151+90-(3x)=0

We add all the numbers together, and all the variables

-3x+261=0

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

-3x=-261

x=-261/-3

x=+87

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