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[175:(72:a-2)+43]•6+12=420

Răspuns :

[175:(72:a-2)+43]×6+12=420
[175:(72:a-2)+43]×6=420-12
[175:(72:a-2)+43]×6=408
175:(72:a-2)+43=408:6
175:(72:a-2)=68-43
175:(72:a-2)=25
72:a-2=175:25
72:a=7+2
a=72:9
a=8