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2+2×{2+2×[2+2×(2+2×2)]}=(2×a+2)×2+2

Răspuns :

2+2×{2+2×[2+2×(2+2×2)]}=(2×a+2)×2+2
2+2×[2+2×(2+2×6)] = 4×a+6
2+2×(2+4+24) = 4×a+6
2+2×30 = 4×a+6
62 = 4×a+6
4×a = 62-6
4×a = 56
a = 56 : 4
a = 14