21=-3(4p-19)

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Solution for 21=-3(4p-19) equation:


Simplifying
21 = -3(4p + -19)

Reorder the terms:
21 = -3(-19 + 4p)
21 = (-19 * -3 + 4p * -3)
21 = (57 + -12p)

Solving
21 = 57 + -12p

Solving for variable 'p'.

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

Add '12p' to each side of the equation.
21 + 12p = 57 + -12p + 12p

Combine like terms: -12p + 12p = 0
21 + 12p = 57 + 0
21 + 12p = 57

Add '-21' to each side of the equation.
21 + -21 + 12p = 57 + -21

Combine like terms: 21 + -21 = 0
0 + 12p = 57 + -21
12p = 57 + -21

Combine like terms: 57 + -21 = 36
12p = 36

Divide each side by '12'.
p = 3

Simplifying
p = 3

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