100+x+x=80

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Solution for 100+x+x=80 equation: 



100+x+x=80

We move all terms to the left:

100+x+x-(80)=0

We add all the numbers together, and all the variables

2x+20=0

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

2x=-20

x=-20/2

x=-10

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