d²8rd-8r8r²d = 8rd³-64r³d = 8rd(d²-8r²)
8×1/8×(-3)×((-3)²-8×(1/8)²) = -3×(9-1/8) = -26⅝
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d²8rd-8r8r²d = 8rd³-64r³d = 8rd(d²-8r²)
8×1/8×(-3)×((-3)²-8×(1/8)²) = -3×(9-1/8) = -26⅝