21-x+4=100

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Solution for 21-x+4=100 equation: 



21-x+4=100

We move all terms to the left:

21-x+4-(100)=0

We add all the numbers together, and all the variables

-1x-75=0

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

-x=75

x=75/-1

x=-75

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