solve cos(53)=r/(r+30)

I just need to find r
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kosine(53)=r / (r+30) . . . (r+30)*kosine=r . . . r*kosine +30*kosine=r . . . r*(kosine-1) +30*kosine=0 . . . r*(kosine-1)=-30*kosine . . . r=-30*kosine/(kosine-1)
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