[tex](29 - 2 \times 7) {}^{2} \times {15}^{20} - {15}^{22} = (29 - 14) {}^{2} \times {15}^{20} - {15}^{22} = 15 {}^{2} \times {15}^{20} - {15}^{22} = {15}^{22} - {15}^{22} = 0[/tex]
