（26.326+x）×0.85＝52.652+76.778-x
    -(4/3)x+(25/6)=(24/7)x
    y=(3/4)*(-22/25)+6
    y=-(3/4)*(-22/25)+6
    (3/4)x+6+(4/3)x-(25/6)=0
    9.6x+9.6×40=24000
    X+X*3%=39890
    x=1.33%x+77350
    x=0.0672x+77350
    13tanx+17cosx=17.8
    x^2-8.4x+11.4=0
    (X-13.98)(X-5)=0.2
    13.24×c=（c+3.2）×7.92
    (x+0)*(x+4)*(x+8)
    （X-4）*(200+20*(10-X)/0.1)=2400
    （X-4）*(200+20*(10-X)/0.1)=2400
    （X-4）*(200+20*(10-X)/0.1)=2400
    (2x−3) 2 =16
    d∧2+4d+6=0
     2/d+1/(d+2)+1/(d+4)=1/(d+1)

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