Question: Simplify doesn't work

Could someone explain to me why this fucking program doesn't simplify a simple equation like this:

simplify(F*R=(1/2*M*R^2)*(a/R),symbolic,assume= positive)


It returns F*R=(M*R*a)/2 which obviously is wrong. (The correct output would be F=1/2*M*a)


How do I fix this, all the other posts I read use either symbolic or assume positive. 

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