Multiply:
(−10d17hj−2a)(18d−8hj−6a)\displaystyle {\left(-{10}{d}^{{{17}{h}}}{j}^{{-{2}{a}}}\right)}{\left({18}{d}^{{-{8}{h}}}{j}^{{-{6}{a}}}\right)}(−10d17hj−2a)(18d−8hj−6a)
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