21=6(1-7p)+3(7p+5)

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Solution for 21=6(1-7p)+3(7p+5) equation: 



21=6(1-7p)+3(7p+5)

We move all terms to the left:

21-(6(1-7p)+3(7p+5))=0

We add all the numbers together, and all the variables

-(6(-7p+1)+3(7p+5))+21=0



We calculate terms in parentheses: -(6(-7p+1)+3(7p+5)), so:

6(-7p+1)+3(7p+5)

We multiply parentheses

-42p+21p+6+15

We add all the numbers together, and all the variables

-21p+21

Back to the equation:

-(-21p+21)



We get rid of parentheses

21p-21+21=0

We add all the numbers together, and all the variables

21p=0

p=0/21

p=0

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