P-a=-r

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Solution for P-a=-r equation: 


Simplifying
P + -1a = -1r

Solving
P + -1a = -1r

Solving for variable 'P'.

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

Add 'a' to each side of the equation.
P + -1a + a = a + -1r

Combine like terms: -1a + a = 0
P + 0 = a + -1r
P = a + -1r

Simplifying
P = a + -1r

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