5x - 10 = (195 - (8x + 17)/2
10x - 20 = 195 - 8x - 17
18x = 198
x = 11
m(arc)FH = 8x + 17 = 8(11) + 17 = 88 + 17 = 105
m(arc)EHF = m(arc)EH + m(arc)FH = 195 + 105 = 300
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