138.009 + 341.981 - 146.305 = 123.6 + ?
Let 138.009 + 341.981 - 146.305 = 123.6 + `x`
Then `x` = (138.009 + 341.981) - (146.305 + 123.6)
= 479.99 - 269.905 = 210.085
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