Evaluate the following:
{(7) -1 – (8) -1} -1 – {(3) -1 – (4) -1} -1
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(-4/9×3/7÷8/-12)÷-2/3
=(-4/21÷-8/12)÷-2/3
=0.285÷-0.66
=-0.431
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