solve for x
x-q/p+q=x+q/p-q
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x-q/p+q=x+q/p-q
by cross multiplication
(p+q) (x+q)=(x-q) (p-q)
px+pq+qx+q^2=xp-xq-qp+q^2
pq+pq+qx+qx=0
2pq+2qx=0
2(pq+qx)=0
pq+qx=0
qx= -pq
x= -pq/q
x= -p
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