7+2p=21

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Solution for 7+2p=21 equation: 


Simplifying
7 + 2p = 21

Solving
7 + 2p = 21

Solving for variable 'p'.

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

Add '-7' to each side of the equation.
7 + -7 + 2p = 21 + -7

Combine like terms: 7 + -7 = 0
0 + 2p = 21 + -7
2p = 21 + -7

Combine like terms: 21 + -7 = 14
2p = 14

Divide each side by '2'.
p = 7

Simplifying
p = 7

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