ΔQd/ΔP =-12 ΔQs/ΔP = +17 so we know the slopes of the two curves. All we have to do is "extend" these lines to where p = 0.

we know when p=1 qd= 82. if we lower p by 1 qd would rise to 94.. Hence, Qd= 94-12p

when p=1 Qs= 5. if p falls by 1, qs falls by 17 or 5-17 = -12. hence Qs = -12+17p

I will let you draw the graphs. Note equilibrium has Qd=Qs or 94-12p = -12 +17p or, 106=29p

so, p= 106/29