（x-70）[20+2（110-x）]=1200
    （x-70）[20+220-2x]7=1200
    (X-X/1.13*0.13)/7.29=0.318
    (X-X/1.13*0.13)/7.29=0.0728
    x^2-0.71x+0.0167=0
    5X÷5=55÷5
    x^6-8*x^5-32*x^4-128*x^3+240*x^2-256=0
    lnx-x+1=0.001
    xlnx-x+1=-0.001
    20-0.5L-50/L=20-L
    (70+x)(10x+7)+x*x*x*x*x*x=2008
    (7*10+x)(10x+7)+x^6=2008
    ((-3-0.4280863a)-(-2+0.9037378a))/((-3-0.4280863a)^2+(-2+0.9037378a)^2+2)=0
    4-x²=（2+x）²-2
    12x^4 - 12x^3 - 9x^2 - 4x + 1
    （-x+18)/9+10/9*x=2*[-3x*(6-2)+4*(3-7x)]-18
    (3-m)^3+2.25+m^2+20.25=45
    1400a-3a^2＝162960
    （8300+x）÷2.92=(3500+x) ÷1.32
    5x+3=2+5x

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