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7x+5+4x+8 = 90°
11x + 13 = 90°
11x = 90-13
11x = 77
x = 7
dit.
7x +5?
7(7) + 5
= 49+5
= 54°
11x + 13 = 90°
x = 7° 》》》 AOC = 7 × 7 +5 = 54