21-x=4x+78

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Solution for 21-x=4x+78 equation: 



21-x=4x+78

We move all terms to the left:

21-x-(4x+78)=0

We add all the numbers together, and all the variables

-1x-(4x+78)+21=0

We get rid of parentheses

-1x-4x-78+21=0

We add all the numbers together, and all the variables

-5x-57=0

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

-5x=57

x=57/-5

x=-11+2/5

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