19980:(7×x-15)=54 решите плиз

Question

19980:(7×x-15)=54 решите плиз

Answer 1

7x-15=19980/54
7x-15=370
7x=370+15
7x=385
x=385/7
x=55

Answer 2

54*(7x-15)=19980
378x-810=19980
378x=20790
x=55