3p-7=21-p

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Solution for 3p-7=21-p equation:


Simplifying
3p + -7 = 21 + -1p

Reorder the terms:
-7 + 3p = 21 + -1p

Solving
-7 + 3p = 21 + -1p

Solving for variable 'p'.

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

Add 'p' to each side of the equation.
-7 + 3p + p = 21 + -1p + p

Combine like terms: 3p + p = 4p
-7 + 4p = 21 + -1p + p

Combine like terms: -1p + p = 0
-7 + 4p = 21 + 0
-7 + 4p = 21

Add '7' to each side of the equation.
-7 + 7 + 4p = 21 + 7

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

Combine like terms: 21 + 7 = 28
4p = 28

Divide each side by '4'.
p = 7

Simplifying
p = 7

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