-2(10-p+1)=-21

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Solution for -2(10-p+1)=-21 equation: 



-2(10-p+1)=-21

We move all terms to the left:

-2(10-p+1)-(-21)=0

We add all the numbers together, and all the variables

-2(-1p+11)-(-21)=0

We add all the numbers together, and all the variables

-2(-1p+11)+21=0

We multiply parentheses

2p-22+21=0

We add all the numbers together, and all the variables

2p-1=0

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

2p=1

p=1/2

p=1/2

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