21=17-3x

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Solution for 21=17-3x equation: 



21=17-3x

We move all terms to the left:

21-(17-3x)=0

We add all the numbers together, and all the variables

-(-3x+17)+21=0

We get rid of parentheses

3x-17+21=0

We add all the numbers together, and all the variables

3x+4=0

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

3x=-4

x=-4/3

x=-1+1/3

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