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240:((9×a-120)×3-100)=3

Răspuns :

240:[(9xa-120)x3-100]=3
240:[(9xa-120)x3]=100+3
240:[(9xa-120)x3]=103
240:[(9xa-120)]=103:3
240:[(9xa-120)]=34
240:[(9xa)]=120+34
240:[(9xa)]=154
[(9xa)]=240x140
[(9xa)]=33600
a=33600:9
a=3733.