3800*x-5000*(1+x)*0.04=0
    (5600-1800)*x-5000*(1+x)*0.08*(1-50%)=0
    5=-4k
    2.3=(x＋3.8)÷(13.2-x)
    (2x-5):(3x+5)=3:7
    0.9x+0.8x+0.8=102.8
    0.9x+(x+1)*0.8=102.8
    124x^2-120x-15=0
    -78698+70000+w-w*2%-1750=8000
     -4082750+W-W*10%/4= 300000
     -4082750+3000000+W-W*10%/4-450000 = 300000
    e^x-x²=0
    asdasdasddsa123123
    asdasdasddsa
    1/x+1/（x+2）+1/（x+3）=1/（x+5）
    x=150-(2491.27-2.30285*x)*((0.622*(2*e^(18.5916-3991.11/(x+233.84))/15)/(100-(2*e^(18.5916-3991.11/(x+233.84))/15)))-0.0089)/1.029
    a=150-(2491.27-2.30285*a)*((0.622*(2*e^(18.5916-3991.11/(a+233.84))/15)/(100-(2*e^(18.5916-3991.11/(a+233.84))/15)))-0.0089)/1.029
    1481544*a^3-2370470400*a^2+1125973440000*a-142228224000000=0
    30+x^2=20x
    7.3y-2.6y

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