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)
    x+2/5x＝2.1
    11x^2-6x-32=0
    4.5=(5X+86)/(X+21)
    d∧2+8d-4=0
    d∧2+8d-4=0
    d∧2+8d-4=0
    d∧2+8d-4=0
    d∧2+8d-4=0
    d∧2+8d-4=0

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