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Ma gandesc la un numar,il inmultesc cu 3,scad 11 si dublez diferenta obtinand 26.

Răspuns :

 (a x 3 - 11 ) x2= 26
( a x 3 - 11 ) = 26 : 2
( a x3 - 11 ) = 13
a x3 = 13 + 11
a x 3 = 24
a = 24 : 3
a = 8

(a×3-11)×2=26
a×3-11=26:2=13
a×3=11+13=24
a=24:3=8