21=1x+2(x+7)+5x

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Solution for 21=1x+2(x+7)+5x equation: 



21=1x+2(x+7)+5x

We move all terms to the left:

21-(1x+2(x+7)+5x)=0



We calculate terms in parentheses: -(1x+2(x+7)+5x), so:

1x+2(x+7)+5x

We add all the numbers together, and all the variables

6x+2(x+7)

We multiply parentheses

6x+2x+14

We add all the numbers together, and all the variables

8x+14

Back to the equation:

-(8x+14)



We get rid of parentheses

-8x-14+21=0

We add all the numbers together, and all the variables

-8x+7=0

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

-8x=-7

x=-7/-8

x=7/8

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