21=x-4-6x

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Solution for 21=x-4-6x equation: 



21=x-4-6x

We move all terms to the left:

21-(x-4-6x)=0

We add all the numbers together, and all the variables

-(-5x-4)+21=0

We get rid of parentheses

5x+4+21=0

We add all the numbers together, and all the variables

5x+25=0

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

5x=-25

x=-25/5

x=-5

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