ap+b=c-dp
Add dp and subtract b from both sides of equation.
ap + dp = c- b
p(a+d) = c-b
Divide both sides by a+d.
p = (c-b)/(a+d)
I'll let you do the second equation.
make p the subject in both equtions
ap+b=c-dp
q - 1/2 p=6-3q
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