Question: Unit problem in maple 13

I have the equation: 4Unit(m)=3Unit(m)+p/(1000Unit(kg/m^3)*9.86Unit(m*s^-2)) I would like p to give med a result in Unit(bar). However, no matter which solve I use it gives me the answer: Error, (in Units:-Standard:-+) the units `m` and `m^2*s^2/kg` have incompatible dimensions I have tried every solve in the menu. if I make the equation myself I get: P=(4Unit(m)-3Unit(m))*(1000Unit(kg/m^3)*9.86Unit(m*s^-2)) And the answer: 9860Unit(Pa) Howcome maple 13 cannot do this for me?
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