3p-21=-4p

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Solution for 3p-21=-4p equation:


Simplifying
3p + -21 = -4p

Reorder the terms:
-21 + 3p = -4p

Solving
-21 + 3p = -4p

Solving for variable 'p'.

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

Add '4p' to each side of the equation.
-21 + 3p + 4p = -4p + 4p

Combine like terms: 3p + 4p = 7p
-21 + 7p = -4p + 4p

Combine like terms: -4p + 4p = 0
-21 + 7p = 0

Add '21' to each side of the equation.
-21 + 21 + 7p = 0 + 21

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

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

Divide each side by '7'.
p = 3

Simplifying
p = 3

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