7-12x-2x=21

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Solution for 7-12x-2x=21 equation: 



7-12x-2x=21

We move all terms to the left:

7-12x-2x-(21)=0

We add all the numbers together, and all the variables

-14x-14=0

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

-14x=14

x=14/-14

x=-1

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