x+x/1.05*0.05+x/1.05*0.05*0.12=300000
    x+x/1.05*0.05+x/1.05*0.05*0.12=350000
    x+x/1.06*0.06+x/1.06*0.06*0.12=350000
    3x+1=7
    x/1.06*0.06+x/1.06*0.06*0.12=350000
    1.83*x=2.44
    55×7.95+15×7.86+90x=160×7.98
    1.41*x=2.92
    x*2.05=2.92
    1/(cosx+x^2)
    -2xx÷25+3÷5x+2=0
    129.26÷((x−5%)×(1−(1+5%)÷(1+x))^(50))=3166
    （18-x）（200+30x）=4480
    (0.212*1+1.212*X)/(1+X)=0.25
    1047.5=80/(1+x)+80/(1+x)^2+80/(1+x)^3+80/(1+x)^4+80/(1+x)^5+80/(1+x)^6+80/(1+x)^7+80/(1+x)^8+1080/(1+x)^9
    400x-2400=-150x+1500
    （38-3x）（160+120x）-22（160+120x）=3640
    （38-3x）（160+120x）-22（160+120x）=3640
    （38-x）（160+120x）-22（160+120x）=3640
    （38-3x）（160+120x）-22（160+20x）=3640

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