Topic: Offsetting Liabilities

Please answer where the x$\text{'}$s are placed with the below facts:

Joe transfers land with a FMV of $$170,000$ and basis of $$100,000$ for land owned by John. Land is subject to a mortgage of $$30,000.$

John transfers land with a FMV of $$150,000.$ Land is subject to a $$10,000$ mortgage.