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5+[90+(20-135:ax3)-54]x6=251

Răspuns :

5+[90+(20-135:ax3)-54]x6=251

[90+(20-135:ax3)-54]x6=251-5

[90+(20-135:ax3)-54]x6=246

90+(20-135:ax3)-54=246:6

90+(20-135:ax3)-54=41

90+(20-135:ax3) = 41+54

90+(20-135:ax3) = 95

20-135:a×3 = 95-90

20-135:a×3 = 5

135:a×3 = 20-5

135:a×3 = 15

135:a = 15:3

135:a = 5

a = 135:5

a = 27