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MCH + HCD = 90°
5y + 32 + 8y + 19 = 90°
13y + 51 = 90
13y = 90 - 51
13y = 39
y = 39/13
y = 3
MCH = 8y + 19 = 8(3) + 19
= 24 + 19
= 43°
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