a×0.6=14.9
    a×0.6=7.6
    3*x^5+4*x^4+7x^3+2x^2+9x+12
    x*1.41=3.68
    √n+1=
    x^3-3x^2-12x+10=0
    （10325+20+X）*3.1%=1.8*X
    （10325+20+X）*3.1%=（200/360）*X
    ((5*(764+x)+228)/(992+x)
    （10325+20+X）*3.1%=4X
    50000*p-50000*p*(1-5%)-50000*11-67500=103550
    50000*x*(1-5%)-50000*11-67500=103550
    50*x+100000=150*x
    50*x+50000=150*x
    25+90+X=15
    25+90-X=15
    45987/X*100%=324
    x*1.31=3.68
    x*1.31=3.68
    x=(x+284400)/1.06*0.06*1.12

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