105=12x+21

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Solution for 105=12x+21 equation: 



105=12x+21

We move all terms to the left:

105-(12x+21)=0

We get rid of parentheses

-12x-21+105=0

We add all the numbers together, and all the variables

-12x+84=0

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

-12x=-84

x=-84/-12

x=+7

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