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
    3.1x÷2＝1.24
    3.1x%2=1.24
    24x-18x=4.2
    0.6x-7*0.9=2.1
    3.8*2+4x=10
    （18x-120）/(17x-160)=6/5
    0.8(x+3)=9.6
    1.5x+2.4x=11.7
    2x+8*0.7=10.4
    x^1/2+x

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