pe=125+0.75(y-100)+(200-10r)+150

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Solution for pe=125+0.75(y-100)+(200-10r)+150 equation: 


Simplifying
pe = 125 + 0.75(y + -100) + (200 + -10r) + 150

Reorder the terms:
ep = 125 + 0.75(-100 + y) + (200 + -10r) + 150
ep = 125 + (-100 * 0.75 + y * 0.75) + (200 + -10r) + 150
ep = 125 + (-75 + 0.75y) + (200 + -10r) + 150

Remove parenthesis around (200 + -10r)
ep = 125 + -75 + 0.75y + 200 + -10r + 150

Reorder the terms:
ep = 125 + -75 + 200 + 150 + -10r + 0.75y

Combine like terms: 125 + -75 = 50
ep = 50 + 200 + 150 + -10r + 0.75y

Combine like terms: 50 + 200 = 250
ep = 250 + 150 + -10r + 0.75y

Combine like terms: 250 + 150 = 400
ep = 400 + -10r + 0.75y

Solving
ep = 400 + -10r + 0.75y

Solving for variable 'e'.

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

Divide each side by 'p'.
e = 400p-1 + -10p-1r + 0.75p-1y

Simplifying
e = 400p-1 + -10p-1r + 0.75p-1y

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