7p+21=3(p+3)

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Solution for 7p+21=3(p+3) equation:


Simplifying
7p + 21 = 3(p + 3)

Reorder the terms:
21 + 7p = 3(p + 3)

Reorder the terms:
21 + 7p = 3(3 + p)
21 + 7p = (3 * 3 + p * 3)
21 + 7p = (9 + 3p)

Solving
21 + 7p = 9 + 3p

Solving for variable 'p'.

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

Add '-3p' to each side of the equation.
21 + 7p + -3p = 9 + 3p + -3p

Combine like terms: 7p + -3p = 4p
21 + 4p = 9 + 3p + -3p

Combine like terms: 3p + -3p = 0
21 + 4p = 9 + 0
21 + 4p = 9

Add '-21' to each side of the equation.
21 + -21 + 4p = 9 + -21

Combine like terms: 21 + -21 = 0
0 + 4p = 9 + -21
4p = 9 + -21

Combine like terms: 9 + -21 = -12
4p = -12

Divide each side by '4'.
p = -3

Simplifying
p = -3

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