(√18-2√12)-(2√3-2)(3√6+√2)+√6(1/√3+1/√2)
=3√2-4√3 -(6√18+2√6-6√6-2√2) +√2+√3
=3√2-4√3-18√2-2√6+6√6+2√2+√2+√3
=-12√2-3√3+4√6