21(10-a)+20(60-5a)=1400
    Kit Kat seasonal flavor
    X*0.86*0.7-11940-2000=82050
    （1+lnx）/x
    (x-10)(-10x+300) = 840
    （x-10)(-10x+300) = 840
    x²+x=84
    -7x+2=2x-4
    4x-2=3x
    1-1.5x=3x+2.5
    （1100-750-x）(30+x/50*10)=12000
    （1100-750-x）(30+x/50X10)=12000
    x^2+0.1x-0.001 = 0
    x^2+0.1x-0.01 = 0
    x^2+0.1x-0.01=0
    x2+0.1x-0.01=0
    x*(1-7%)=8440650.47
     (14)(x+800)+(14)(x+500)+7x/12+18x/12 +108x =407880-24100
    879x-x²=7402.6
    0.74*5.67*10^-8*x^4+3435.9*x = 0.74*5.67*10^-8*1173^4+3435.9*706

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