X-10/x-9=10/11 помогите

Question

X-10/x-9=10/11 помогите

Answer 1

11*(x-10)=10*(x-9)
11x-110=10x-90
11x-10x=-90+110
x=20
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Answer 2

Икс не равен 9 ; 11 * ( Х - 10 ) = 10 * ( Х - 9 ) ; 11х - 110 = 10х - 90 ; Х = 20