15（x+16）-3571=16X+13
    (π*X²+1.5)%2
    29203.54+x*0.08=x/7
    x^3+2x^2+6x-8
    1.1x-1.2/1.2=x-1/1-10%
    7^7-50x7^5+6x7^4+4x7^3+25x7^2-30x7-16
    7^7-50x7^5+6x7^4+4x7^3+25x7^2-30x7-16
    X／70＝X／60一1
    X／70＝X／60一1
    X／70＝X／60一1
    (2x+1)/(x+2)=3/2
    （20-y）*（500+50y）=10800
    (2y-1)/4=1-(3-y)/8
    x/3-(x-1)/5=1
    (3x+5)/2=(7x-5)/3
    (3x+5)/2=(7x-5)/3
    (3x+5)/2=(7x-5)/3
    sin(x)sin(2/3π-x)=1/3
    abs（x^3+x）/√（x^2-1）
    {[(x-55)/45]^2}*15.9=15.81

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