4-7x=21

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Solution for 4-7x=21 equation: 



4-7x=21

We move all terms to the left:

4-7x-(21)=0

We add all the numbers together, and all the variables

-7x-17=0

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

-7x=17

x=17/-7

x=-2+3/7

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