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    4x-2=4
    (x-500)/2200=(x-440)/1700
    (x-500)/2200=(x-400)/1700
    1700*(x-500)=2200*(x-440)
    1700*(x-500)=2200*(x-400)
    a^5-2*a^4+2*a^3-2*a^2+a=0
    60X^2-15X^4=0
    x×sin(1/x)
    280x=240x+960
    1÷4(x-1)=1÷3(x-3.6-1)
    280x=240x+960
    0.25(x-1)=0.3(x-3.6-1)
    0.25(x-1)=0.3(x-3.6-1)
    0.25(x-1)=0.333333333(x-3.6-1)
    120xcos2x=80-x
    (8850+25+X)*3.15%=4X
    (8850+25+X)*3.5%=4X
     (103/160)^x+0.9=1.2
    a^2-8.73a+4.25=0
     (5/7)^x+0.9=1.3

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