4p+21=p+42

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Solution for 4p+21=p+42 equation:


Simplifying
4p + 21 = p + 42

Reorder the terms:
21 + 4p = p + 42

Reorder the terms:
21 + 4p = 42 + p

Solving
21 + 4p = 42 + p

Solving for variable 'p'.

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

Add '-1p' to each side of the equation.
21 + 4p + -1p = 42 + p + -1p

Combine like terms: 4p + -1p = 3p
21 + 3p = 42 + p + -1p

Combine like terms: p + -1p = 0
21 + 3p = 42 + 0
21 + 3p = 42

Add '-21' to each side of the equation.
21 + -21 + 3p = 42 + -21

Combine like terms: 21 + -21 = 0
0 + 3p = 42 + -21
3p = 42 + -21

Combine like terms: 42 + -21 = 21
3p = 21

Divide each side by '3'.
p = 7

Simplifying
p = 7

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