>>548
 (0.037+x+0.0165)/0.85 - (0.037+x+0.0165) = 0.085

 (0.037+x+0.0165)(1/0.85- 1) = 0.085

 (0.037+x+0.0165) = 0.085/(1/0.85 - 1) = 0.481667

 x = 0.481667 - (0.037+0.0165) = 0.428167
ぢゃね?