105=12x+9x

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Solution for 105=12x+9x equation: 



105=12x+9x

We move all terms to the left:

105-(12x+9x)=0

We add all the numbers together, and all the variables

-(+21x)+105=0

We get rid of parentheses

-21x+105=0

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

-21x=-105

x=-105/-21

x=+5

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