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32:8+3×[60+8×(360:a-72:4)]=712

Răspuns :

32÷8+3×[60+8×[360:a-18]]=712

4+3x(60+8x(360:a-18)=712
4+3x(60+2880:a-144)=712
4+180+8640:a-432=712
184+8640:a=712+432
184+8640a=1144
8640=1144-184
8640a=960
ax960=8640x1
a=8640:960
a=9