21-6x=45

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Solution for 21-6x=45 equation: 



21-6x=45

We move all terms to the left:

21-6x-(45)=0

We add all the numbers together, and all the variables

-6x-24=0

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

-6x=24

x=24/-6

x=-4

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