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    40x²+18x-1=0
    1/x-1/(50+x)=1/15
    1/x-1/(50+x)=1/14
    4.5/x-4.5/(50+x)=0.3
     (1+x)^3 = 0.135 x=
     (1+x)^3 = 0.135
    4.5/x-4.5/(50+x)=0.3
    91.2+64+(17-x)*4.3=(165.8+6.5x)/1.5
    (1+1.7321^2)x^2-20*1.7321*x+75=0
    134.4+64+(17-x)*4.3=(139.2+6.5x)/1.5
    134.4+64+(17-x)*4.3=(89.2+6.5x)/1.5
    x^5+10*x^3+20*x-4=0
    x5+10*x3+20*x-4=0
    3.14×x÷3+3.14×(x÷3÷2)²×2=32.9
    x+12/x=8
    2x+7.8x
    2x+7.8x
    7.4676796678767976767679/x+2x=0
    1-25%x=0.4
    4.5/x-4.5/(50+x)=0.3

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