Sounds like homework (correct me if that assumption is wrong, as you may want a somewhat different answer then.), so here is a hint:
Clean up the equation first, to something that looks more like an equation for mass:
fracLLsun=left(fracMMsunright)3.5fracLLsun=left(fracMMsunright)3.5
left(fracLLsunright)frac13.5=fracMMsunleft(fracLLsunright)frac13.5=fracMMsun
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