400-100÷80%X-70%X
    （400-100）÷（80%X-70%X）
    26+9t-4.9t^2=30
    15%x-120=10%x+120
    15%x-10%x=120+120
    15%x+120=10%-120
    15%x-120=10%+120
    x^4+64x
    -2x*x*x+8x*x-23x-40=0
    -1/9（x-6）²+4 = 1
    （20- x）(35-2x)=558
    x+5x/10=6000
    x+7=8
    lnx+(lnx)/1
    -10.7478t^{3}-72.69113t^{2}+95.158t + 179.4246 = 0
    56/100=x/285
    7926.1=（440*21-x）*0.9+40*21
    x=1-2(128x^8-256x^6+160x^4-32x^2+1)^2
    5.103*10^-8x^4+10x-23307.5=0
    5.13x10^-8X^4+10X-23005.35

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