500=640-20p

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Solution for 500=640-20p equation:


Simplifying
500 = 640 + -20p

Solving
500 = 640 + -20p

Solving for variable 'p'.

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

Add '20p' to each side of the equation.
500 + 20p = 640 + -20p + 20p

Combine like terms: -20p + 20p = 0
500 + 20p = 640 + 0
500 + 20p = 640

Add '-500' to each side of the equation.
500 + -500 + 20p = 640 + -500

Combine like terms: 500 + -500 = 0
0 + 20p = 640 + -500
20p = 640 + -500

Combine like terms: 640 + -500 = 140
20p = 140

Divide each side by '20'.
p = 7

Simplifying
p = 7

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