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73 = (50.1 + 60.5 + 70x+80.4+90.3+100.1) / 14 + x
73 = 1040+70x / 14 + x
73(14+x) = 1040 +70x
1022 + 73x = 1040 +70x
73x - 70x = 1040 - 1022
3x = 18
x = 18/3
x = 6