Mathematics
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    4^x=25
    5x-3=0
    6*(4x+3)-6*(x+49)
    (x^2-6x+10)(x^2+2x+5)
    x+10=20
    (12.88*0.021+360.2)^0.05*3.981^0.84
    3.981^1.85
    (-x^2/50) + 10x - 300=0
    -x^2-4X+5=0
    ln(x)=0.37
     (-x^2/50) + 10x - 300 =0
     (-x2/50) + 10x - 300 =0
    (-2x)^4+(-2x^2)^2
    a^2=2.6×(1-a)(4-a)
    8x^2-26x+13=0
    (1*120+0.8*50)/(0.9*120+0.6*50)
    (1*70+0.8*60)/(0.9*70+0.6*60)
    (1*70+0.8*60)/(0.9*7+0.6*60)
    6368.5+6553.2+6833+7081.3+7117.6=
    sin144

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