10+10^x=100^x
    x＝1/e
    lnx+1/x=4-x
    5200*x=300
    （85-x）/（x-51）＝17.7
    -lnx+1/x=4-x
    2(x+5+19.2)=50+220-2x
    2(x+5+19.2)=50+66+220-2x
    2(x+5+19.2)=220+66-2x
    2(x+5+19.2)=220+66-2x
    2(x+5+19.2)=50+66.2+160-2x
    2(x+5+19.2)=222+66.2-2x
    2(x+5+19.2)=222+66.2-2x
    2cos2x+1
    x3-3x2
    40t－3t ^2＝600
    40t－3t2＝600
    （85-x）/（x-71）=0.5
    85-x/x-71=0.5
    8000×x×12＋15×x×30×12＝1571182

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