Notez numarul cu ,, a "
a x 3 - 15 : 3 : 5 = 35 ( Daca imparti treimea la 5, nu diferenta )
a x 3 - 5 : 5 = 35
a x 3 - 1 = 35
a x 3 = 35 + 1
a x 3 = 36
a = 36 : 3
a = 12 → numarul
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(a x 3 - 15 : 3) : 5 = 35 ( Daca imparti la 5 diferenta obtinuta )
a x 3 - 5 = 35 x 5
a x 3 = 175 + 5
a x 3 = 180
a = 180 : 3
a = 60
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