Mathematics
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    0.019*x^2=2989.657+14.2367*e^(0.00004745*x)
    xe^x=-ln(1-x)
    2(x+5)=50+88.2+250-2x
    1+5x=0.87
    100×1.6x+80×1.4(x+5)=1080
    x*x+x=272
    (544+172x)/(841+472x)=0.5
    (544+172x)/(841+472x)=1/2
    315*x+215*x*(4.86-x)=4.86*264
    315*x+215*x*(4.86-x)=4.86*264
    x=sqrt-1
    x^2+4x+5
    x^18+x^10=87
    sqrt(x^4+8x^3+17x^2)=2sqrt5
    X/2=(3X-10)/5
    x+6*4/2*5=80
    x∧2+2x+7=0
    x∧2+2x+7=0
    3g=0
    5*h/2*6=75

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