r+p=400

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Solution for r+p=400 equation: 


Simplifying
r + p = 400

Reorder the terms:
p + r = 400

Solving
p + r = 400

Solving for variable 'p'.

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

Add '-1r' to each side of the equation.
p + r + -1r = 400 + -1r

Combine like terms: r + -1r = 0
p + 0 = 400 + -1r
p = 400 + -1r

Simplifying
p = 400 + -1r

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