-21=9-6p+4p

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Solution for -21=9-6p+4p equation:


Simplifying
-21 = 9 + -6p + 4p

Combine like terms: -6p + 4p = -2p
-21 = 9 + -2p

Solving
-21 = 9 + -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 = 9 + -2p + 2p

Combine like terms: -2p + 2p = 0
-21 + 2p = 9 + 0
-21 + 2p = 9

Add '21' to each side of the equation.
-21 + 21 + 2p = 9 + 21

Combine like terms: -21 + 21 = 0
0 + 2p = 9 + 21
2p = 9 + 21

Combine like terms: 9 + 21 = 30
2p = 30

Divide each side by '2'.
p = 15

Simplifying
p = 15

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