84=21x-105

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Solution for 84=21x-105 equation: 



84=21x-105

We move all terms to the left:

84-(21x-105)=0

We get rid of parentheses

-21x+105+84=0

We add all the numbers together, and all the variables

-21x+189=0

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

-21x=-189

x=-189/-21

x=+9

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