sin(18.19635x)=16.8214x
    sin(18.19635x)=17.14945x
    sin(18.19635x)=17.34465x
    sin(18.19635x)=17.56895x
    20+2000/x-90x-8000/[(x-1)x]
    x+1/x+16/x^2+1
    （25.851+x）×0.85＝51.702+67.353-x
    （25.851+x）×0.85＝51.702+68.353-x
    （25.851+x）×0.85＝51.702+69.353-x
    （25.851+x）×0.85＝51.702+70.353-x
    （25.851+x）×0.85＝51.702+71.353-x
    （25.851+x）×0.85＝51.702+72.353-x
    （3.4+c）×7.92=12.06×c
    4X一10=26
    12.06× c=（3.3+c）×7.92
    5t*t-12t＝0
    4t(6-t)=72
    10000(0.018+0.042)=12500*(0.018+x)
    10000(0.018+0.042)=1250*(0.018+x)
    10000(1.8+4.2)=1250*(1.8+x)

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