44.8+(x-20)1.1 = 1.3x
    44.8+(x-20)1.1=1.5x
    1/6(x+3)(x-4)=0
    X-(X*0.06)=6341.78
    1/x
    (8x-4X)÷2=25
    2(12x-50)=9/8*12(x+18)
    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

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