y^2+21y-75 = 0
    0.2/3.322×10∧15＝4x∧2
    (0.2-2x)/（2x）∧2＝3.322×10∧15
    4.052x∧2+2x-0.2=0
    (0.2-2x)/4x∧2=1.013
    ㏑x=0.05917/2×0.4592
    π∧x
    π∧x
    π∧x x
    s^3+15s^2+50s+750=0
    2x^3-x^2=1
    x=arccos(-3/28)
    x=arccos(-3/28)
    X+(X*19.4%)=3099
    116m²+144m+49=0
    116x²+124x+49=0
    2(x)^(4x)
    x^2-x-6=0
    lnx＝-2.398
    （（10*3）-14）÷（3+5）=x

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