(1.5x+x)*3=600
    x^4+x=10
    (x/(x-1))^(x-1)-x=0
    (x/(x-1))^x-x=0
    7500/1.5x-4000/x=0.5
    7500/1.5x-400/x=0.5
    5cosx/x²+1
    （s+2）×（s+2）×（s+3）
    （s+1）×（s-2）×（s+3）
    0.5×y/60+30×5+15×1/2-6y = 6y-3×30-6×y/60
    0.5×y/60+30×5+15×1/2-6y=6y-3×30-6×y/60
    100*（1+x）^5=200
    100*（1+x）^8=200
    50x²-10x-24
    x+2=0
    tan0.5x＋tan0.02x ＝0
    0=-1/x^2+12/5x
    (y+2)÷2022+1=3y+12259387÷2022+6
    -2021÷2022+1=-2021×3+k
    x÷2022-1=0

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