3x（400x2X）+4X+5X=1560
    0.15x = 65*0.15
    3x（400x2X）+4X+5X=1560
    2/3x-1/3
    log(x,x-6)=1/2
    -7278.5x^2+590.26x+128.33=141.8
    ln1-x/1+x
    X^2-180x+3600=0
    x-3/2+x-1/3=4
    3x^2-6x-2=0
    12x^2+14x-20=0
    x+x*0.01=7759
    （400-X）（8➕x÷10）=33000
    19*1.05^x＝28
    120X∧2-61X-840
    17/x*1000000 = 191/100
    x+1=2 6+77=y
    x+1=2
    3x（400-2X）+4X+5X=1560
    3x（400-2X）+4X+5X=1560

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