x+2x+21+x+2x+21+90=180

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Solution for x+2x+21+x+2x+21+90=180 equation: 



x+2x+21+x+2x+21+90=180

We move all terms to the left:

x+2x+21+x+2x+21+90-(180)=0

We add all the numbers together, and all the variables

6x-48=0

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

6x=48

x=48/6

x=8

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