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determinati nr x din egalitatea [(ax3-2):2+15]:4=5

Răspuns :

[(ax3-2):2+15]:4=5
(ax3-2):2+15 = 5×4
(ax3-2):2+15 = 20
(a×3-2):2 = 20-15
(a×3-2):2 = 5
a×3-2 = 5×2
a×3-2 = 10
a×3 = 10+2
a×3 = 12
a = 12:3
a = 4