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    1/6+(1/3+1/6)h=1
    (1/3+1/6)x=1
    6x+8(x+1.5x)=1300
    -x²+40x-200=4
    5-y=16
    x-9=8
    x²-40x+204=0
    3x+1=4
    25*10+5(x-10)=0.9*(25*10+5x)
    25*(4000*0.75-2500) + 25*(2500*y/10-1500)=0.15*100000
    25*(4000*0.75-2500)=25*(2500*y/10-1500)
    x²+(36/5)²=81
    lnx=-1.61
    8x^2-10x-18=0
    x/sinx
    4x^2-14x-18=0
    200x^3+42x+11=0
    (-x+√(x^2+8))(-7x+√(49x^2-24))=8
    2/x-2(3/x+3/2)=0
    0.4(5+x)=0.2(20+x)

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