Qd=-0.4P+7

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Solution for Qd=-0.4P+7 equation: 


Simplifying
Qd = -0.4P + 7

Reorder the terms:
dQ = 7 + -0.4P

Solving
dQ = 7 + -0.4P

Solving for variable 'd'.

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

Divide each side by 'Q'.
d = 7Q-1 + -0.4PQ-1

Simplifying
d = 7Q-1 + -0.4PQ-1

Reorder the terms:
d = -0.4PQ-1 + 7Q-1

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