8p-84=p+21

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Solution for 8p-84=p+21 equation:


Simplifying
8p + -84 = p + 21

Reorder the terms:
-84 + 8p = p + 21

Reorder the terms:
-84 + 8p = 21 + p

Solving
-84 + 8p = 21 + 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.
-84 + 8p + -1p = 21 + p + -1p

Combine like terms: 8p + -1p = 7p
-84 + 7p = 21 + p + -1p

Combine like terms: p + -1p = 0
-84 + 7p = 21 + 0
-84 + 7p = 21

Add '84' to each side of the equation.
-84 + 84 + 7p = 21 + 84

Combine like terms: -84 + 84 = 0
0 + 7p = 21 + 84
7p = 21 + 84

Combine like terms: 21 + 84 = 105
7p = 105

Divide each side by '7'.
p = 15

Simplifying
p = 15

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