3x+100+3x+x=660

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Solution for 3x+100+3x+x=660 equation: 



3x+100+3x+x=660

We move all terms to the left:

3x+100+3x+x-(660)=0

We add all the numbers together, and all the variables

7x-560=0

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

7x=560

x=560/7

x=80

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