54:45=(x+1):(x-1)怎么解

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54:45=(x+1):(x-1)怎么解
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54:45=(x+1):(x-1)
54/45=(x+1)/(x-1)
6/5=(x+1)/(x-1)
6(x-1)=5(x+1)
6x-6=5x+5
6x-5x=5+6
x=11