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    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)
    -63x^2+610x-285
    0.047 = -0.0009x2 + 0.0178x + 0.1168
    x=840-2*(860-2x)
    x=2*(860-2x)-840
    x+4/0.3-2x-0.3/0.5=1
    y = -0.0007*17.8832^2+0.0294*17.8832+0.0061
    x^2-2x+5=0
    12×6×47+6×6×6=15×15x
    x^3+0.1x^2=2*10^(-29)
    5y-8y+3y=12-6

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