x+(x*13%)=100
    3 4 4 16=12.25
    4:36
    e3
    X^2=50^2+(X-6.19)^2
    2【（30-2x）x+（20-2x）x】=200
    2【（30-x）x+（20-x）x】=200
    2（30-x）x+2（20-x）x=200
    2（30-x）+2（20-x）=200
    4（x-4）^2=400
    2^2-2（2k-1）=（2k-1）^2
    22-2（2k-1）=（2k-1）2
    20t-5t^2=0
    5x=7.2
    4x^2-2x-1=0
    （x-1）^2=6
    x^2-2x-5=0
    （3y－1）∧2
    3.75*（t0-41）=(58-t0)
    3.75*1

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