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
    2*3.14*x+2*x=82.8
    4.5703=（（30.56*0.847（x+0.1））/（1+0.847（x+0.1））*（（100-8.28-1.4）/100）*（1/(1+0.31*1.4）+（（2.26（x+0.1））/（1.3*0.101325））
    (x+1)^2*(x-1)/2=0
    (x+1)^2*(x-1)*1/x=0
    (x+1)^2*(x-1)/x=0
    (x+1)^2*(x-1)/x=0

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