21-x=4x-4

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



21-x=4x-4

We move all terms to the left:

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

We add all the numbers together, and all the variables

-1x-(4x-4)+21=0

We get rid of parentheses

-1x-4x+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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