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    205.5/28*x+280/28*(x+15)+56/28(x+30)=635
    x*10%+(1-x)*8%=9.4%
    (172+206)/28*x+241/28*(x+15)+112/28(x+30)=1867
    200=(20+5)x
    w^4 *(w^2+1)*(100w^2+1)=40000
    256w^4+68w^2+1=4
    1+1=x
    5^x=10x+5
    x×lnx
    3x^2-55x+36
    X∧X-42X-6
    x+1=0
    (110-x)(10+x)=3500
    25+x=32.5+146.106-x
    x*10%+ (1-x)*8%=9.4%
    (94194-1.1X)*12/25*0.9=10X
    x+30=6
    3-2(x+1)=2(x-3)
    6X+9=9X-6
    12.1c=(3.5+c)×7.92

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