1=21-2p

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Solution for 1=21-2p equation:


Simplifying
1 = 21 + -2p

Solving
1 = 21 + -2p

Solving for variable 'p'.

Move all terms containing p to the left, all other terms to the right.

Add '2p' to each side of the equation.
1 + 2p = 21 + -2p + 2p

Combine like terms: -2p + 2p = 0
1 + 2p = 21 + 0
1 + 2p = 21

Add '-1' to each side of the equation.
1 + -1 + 2p = 21 + -1

Combine like terms: 1 + -1 = 0
0 + 2p = 21 + -1
2p = 21 + -1

Combine like terms: 21 + -1 = 20
2p = 20

Divide each side by '2'.
p = 10

Simplifying
p = 10

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