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100 - (285-6*(5*A-25):9):5=43





Răspuns :

(285 -6 x ( 5a- 25 ):9): 5 =100 - 43 = 57
285 - 6 x ( 5a - 25 ) : 9 = 5 x 57= 285
6 x ( 5a - 25 ) : 9 = 285 - 285 = 0
6 x ( 5a - 25 ) = 0 x 9 = 0
5a - 25 =0
5a = 25 + 0
5a = 25
a = 25 : 5 =5