150y-y^2=3600
    1/2-x/2=2-x
    2210492.13-x-0.05x-650+12611.59=663041.07
    2x^2+2x＝11
    8x+x+4＝11
    8x^2+4x+4＝11
    0.|123x=1
    x^2+7x=60
    sin(cos(tan6x))=1
    log(x,6)=2
    21x+120=901
    X-X*0.065-(X+25000)*0.0003=25000
    ln(1+x)+x=1
    （b+6）×4=
    x²-4x-5=0
    x-13.4+5.2=1.57
    3.9x*2=15.6
    9.1x-5.6x=63
    0.3(x+0.9)=18
    4x-15.5=4.5

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