21=2p+4+7

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Solution for 21=2p+4+7 equation:


Simplifying
21 = 2p + 4 + 7

Reorder the terms:
21 = 4 + 7 + 2p

Combine like terms: 4 + 7 = 11
21 = 11 + 2p

Solving
21 = 11 + 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.
21 + -2p = 11 + 2p + -2p

Combine like terms: 2p + -2p = 0
21 + -2p = 11 + 0
21 + -2p = 11

Add '-21' to each side of the equation.
21 + -21 + -2p = 11 + -21

Combine like terms: 21 + -21 = 0
0 + -2p = 11 + -21
-2p = 11 + -21

Combine like terms: 11 + -21 = -10
-2p = -10

Divide each side by '-2'.
p = 5

Simplifying
p = 5

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