[tex](8 { } ^{2} - 15 \times 3 - 2 {}^{3} ) - (9 {}^{3} ) {}^{4} \div (9 {}^{4} ) {}^{2} \div 9 {}^{3} + (2 {}^{2} + 4 {}^{2} - 6) = [/tex]
