21+7x=4(7+2x)

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Solution for 21+7x=4(7+2x) equation: 



21+7x=4(7+2x)

We move all terms to the left:

21+7x-(4(7+2x))=0

We add all the numbers together, and all the variables

7x-(4(2x+7))+21=0



We calculate terms in parentheses: -(4(2x+7)), so:

4(2x+7)

We multiply parentheses

8x+28

Back to the equation:

-(8x+28)



We get rid of parentheses

7x-8x-28+21=0

We add all the numbers together, and all the variables

-1x-7=0

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

-x=7

x=7/-1

x=-7

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