（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
    t×t+5t=9.3
    (x^2-2*x+2)^2-9+6x-x^2 =0
    46×8.86+12.2c=（46+c）×8.97
    2x+1/5=3
    -26/7-5x=12
    x²－2x－3
    2x+35/2=12
    6.7x+9.4=12.3（x-4）+2.6
    4x^2-4x+5=0
    12.07x=(x+3.4)*8.97
    12.07x=(x+3.3)*8.97
    12.07x=(x+3.2)*8.97
    X×100-X=193.05
    X-193.05=X÷100
    X-193.05X÷100=X÷100

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