90+x+61+3x+21=180

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Solution for 90+x+61+3x+21=180 equation: 



90+x+61+3x+21=180

We move all terms to the left:

90+x+61+3x+21-(180)=0

We add all the numbers together, and all the variables

4x-8=0

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

4x=8

x=8/4

x=2

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