-2x+4=21

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Solution for -2x+4=21 equation: 



-2x+4=21

We move all terms to the left:

-2x+4-(21)=0

We add all the numbers together, and all the variables

-2x-17=0

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

-2x=17

x=17/-2

x=-8+1/2

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