(1.5)(10^-4) = [0.37 - (9.8)(2.1)(10^-4)]d

$$\\(1.5)(10^{4}) = [0.37 - (9.8)(2.1)(10^{4})]d\\\\ (1.5)(10^{4}) \div [0.37 - (9.8)(2.1)(10^{4})]=d\\\\$$

Someone else can finish it if they want to :)

d=0.000407673

Hi Bio,

If you use the forum calc [Calculation e.g.1+2=3] button 

then we can all see if you have done it correctly :))