Răspuns :
2(a + 4×6 - 3×7) = 15 + 6÷2×3
2(a + 24 - 21) = 15 + 9
2a + 6 = 24
2a = 18
a = 9
Salut,
2 × (a + 4 × 6 - 3 × 7) = 15 + 6 ÷ 2 × 3
2 × (a + 24 - 3 × 7) = 15 + 3 × 3
2 × (a + 24 - 21) = 15 + 9
2 × (a + 24 - 21) = 24
a = (24 ÷ 2) + 21 - 24
a = 12 + 21 - 24
a = 33 - 24
a = 9
