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(36:a+63:9):2=8 ...............

Răspuns :

( 36 : a + 7 ) : 2 = 8
36 : a + 7 = 16
36 : a = 9
a = 4
(36:a+7):2=8
36:a+7=8*2
36:a=16-7
36:a=9
a=36:9
a=4