7+5p-4=9p+21-7p

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Solution for 7+5p-4=9p+21-7p equation:


Simplifying
7 + 5p + -4 = 9p + 21 + -7p

Reorder the terms:
7 + -4 + 5p = 9p + 21 + -7p

Combine like terms: 7 + -4 = 3
3 + 5p = 9p + 21 + -7p

Reorder the terms:
3 + 5p = 21 + 9p + -7p

Combine like terms: 9p + -7p = 2p
3 + 5p = 21 + 2p

Solving
3 + 5p = 21 + 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.
3 + 5p + -2p = 21 + 2p + -2p

Combine like terms: 5p + -2p = 3p
3 + 3p = 21 + 2p + -2p

Combine like terms: 2p + -2p = 0
3 + 3p = 21 + 0
3 + 3p = 21

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

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

Combine like terms: 21 + -3 = 18
3p = 18

Divide each side by '3'.
p = 6

Simplifying
p = 6

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