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
    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

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