100=7x+12x+x

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Solution for 100=7x+12x+x equation: 



100=7x+12x+x

We move all terms to the left:

100-(7x+12x+x)=0

We add all the numbers together, and all the variables

-(+20x)+100=0

We get rid of parentheses

-20x+100=0

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

-20x=-100

x=-100/-20

x=+5

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