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The equations are
Equation (1)
Equation (2)
Solve the second equation for p in terms of q.
Apply addition property of equality; if a = b, then a + c = b + c.
(Add 4q to each side)
(Apply Additive inverse property: )
(Apply Additive identity property: )
Combine like terms using distributive property: .
Apply division property of equality: if a = b, then.
(Divide each side by 2)
(Cancel common terms)
Substitute in Equation (2).
Distribute terms using distributive property: .
(Multiply: )
(Apply Additive inverse property: )
(Apply Additive identity property: )
q = 0
Substitute in equation in equation .
(Apply zero product property: )
(Apply additive identity property: )
The solution is .
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