-21=4p-7p

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Solution for -21=4p-7p equation:


Simplifying
-21 = 4p + -7p

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

Solving
-21 = -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 + 3p = -3p + 3p

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

Add '21' to each side of the equation.
-21 + 21 + 3p = 0 + 21

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

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

Divide each side by '3'.
p = 7

Simplifying
p = 7

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