x-x*0.015=15420.13
    ((x^3)^-2)=1000
    -2+2P=10-2P
    10-2P=-2+2P
    16x^2-712x+195=0
    16x^2-712x+195=0
    （40.221+x）×1.95＝40.221+71.242-x
    （40.221+x）×1.75＝40.221+71.242-x
    （40.221+x）×1.55＝40.221+71.242-x
    （40.221+x）×1.35＝40.221+71.242-x
    （40.221+x）×1.15＝40.221+71.242-x
    3*x^5+2*x^4+x^3-x=2
    1.5A=0.6A+150
    50x^20+50x^19+50x^18+50x^17+50x^16 =647.979
    e^(-x^2)
    x+x*0.1=1134
    2x＾2+13859x+53800=0
    tanx＝2x
    tanx＝3x
    5＾x-3^x=16

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