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    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
    5(x^25+x^24+x^23+x^22+x^21)-1.75(x^19+x^18+x^17+x^16+x^15+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)=26.3557
    5(x^25+x^24+x^23+x^22+x^21)-1.75(x^19+x^18+x^17+x^16+x^15+x14+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)=26.3557
    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
    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)=22.1877
    (-3)+3y=-7
    (-3)+3y+7=0
    cos(2x-6/π)
    X-(X-8)=5
    x+2lnx-1

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