21=6x+3x-4-4x

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Solution for 21=6x+3x-4-4x equation: 



21=6x+3x-4-4x

We move all terms to the left:

21-(6x+3x-4-4x)=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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