4y-3（20-y）=6
    11297000*x*(1－sin(2*3.14*x)/(2*π*x))+(3x-1.25)*360*6381.7=0
    a²+（16-4a/3）²＝16
    1.6x-sin(2πx)/2πx=0.25
    1/x-1=2x-1/x
    1/x=2x/x+1
    1/x=2x/x
    ((3.3-x)/130+0.014)*83=x
    3-x=1
    50.2x²－120x+65.8＝0
    1/sin(x)-x*(1-x^2)^0.5-0.34125=0
    1/sin(x)-x*(1-x^2)^0.5-0.006140625=0
    1-1-x/1
    （32351-29127.22）/（29127.22-2900）=（100-x）/（x-100）
    32351-29127.22/29127.22-2900=100-x/x-100
    0*sin(x)+0.7156*cos(x)+1.72263*cos(x)*sin(x/2)-0.23855 = 0
    0sin(x)+0.7156*cos(x)+1.72263*cos(x)*sin(x/2)-0.23855 = 0
    0.0775sin(x)+0.5601*cos(x)+4.28809*cos(x)*sin(x/2)-0.18671 = 0
    0.1451sin(x)+0.21362*cos(x)+6.91206*cos(x)*sin(x/2)-0.071207 = 0
    15÷（100＋x）

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