8x+20=5
    x*0.65*2=2.13
    x*0.65=2.13
    x*0.88*2.03=2.85
    x*0.88*2.03=2.8
    x*0.88=2.8
    x*0.88*2.55=7.15
    x*0.88*1.55=7.15
    x-(x*0.15+x*0.15)=280
    x-(x*0.15-x*0.15)=280
    X-（X*0.15-X*0.15）=280
    1/3（100-x）-1/10x=16
    0.8*x+0.2/x=1
    x²-x-1
    5（x^10+x^9+x^8+x^7+x^6）-1.75（x^4+x^3+x^2+x+1)=22.1877
    5（x^15+x^14+x^13+x^12+x^11）-1.75（x^9+x^8+x^7+x^6+x^5+x^4+x^3+x^2+x+1)=24.2241
    （X-5）*50=300+80*50
    5（x^20+x^19+x^18+x^17+x^16）-1.75（x^14+x^13+x^12+x^11+x^10+x^9+x^8+x^7+x^6+x^5+x^4+x^3+x^2+x+1)=25.7284
    （X-5）*50=300+8*50
    （X-5）*50=300+80*50

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