2*（1+2*(1+2x)）=1
    2*（1+2*(1+2x)）=1
    2*（1+2*(1+2x)）=1
    2*（1+2*(1+2x)）=1
    100=121/（1+i）²
    x²-2.5x-0.75＝0
    100=121/（1+i）2
    （9.57-x）/x*100=8.18
    100=121/（1+i）2
    5x+x÷5=52
    √(x+1)+√（x+2）+√（x+3）=72
    5x+x÷5=52
    X-X*0.129-X/0.255*0.15-X*0.005-X*0.06-8.5-X/1.17*0.17=0
    0.25x/17.5+0.25x/21-0.5x/21=0.05
    0.25x/17.5-0.75x/21=0.05
    0.25x/17.5-0.75x/21=3
    (x-2020)^2+(x-2024)^2=30
    (8x+(1.5x*3))*22+8*2*12x=7000
    (8x+(1.5x*3))*22+8*12x=7000
    (8x+(1.5x*3)*22+8*12x=7000

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