logx=-4.26
    X-X/1.01*0.01*1.12=559750-35486.04
    X/167+(67.8-X)/1000+10/133.58=0.235
    4^(3x+1)=9^2x
    e^4=2x^2
    2Inx+Inx^2=4
    7^x=27
    X/126-(950-X)/200=2.47
    X/126-(950-X)/200=2.47
    2x+3=2.8
    X/135-(950-X)/200=2.47
    X/135-(1000-X)/200=2.47
    27^x=7
    7^(x+3)=27^(x+2)
    0.125^x=0.03125
    logx=-2
    π*(D^2-74^2)=500000*4*0.042
    x²-x=420
    1/(3-x)∧2+1/(1+x)∧2+1/(2-x)∧2＝1
    X-(1+20%)*80%X=56

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