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    19520×(20+770x)=713964
    x+x*0.05=1402
    19520×(1+x)^29×((1+x)^20-1)÷x=713964
    1/5x+30=3/5(x-30)
    90-(X+3)/4=84
    -2m^2+2m+6=(2m+1)^2-(2m+1)-1
    x∧2-2358x+1892.74*10∧6*2/11.5*1500=0
    2000=(18199.69+x+((18199.69+x)/22))*((-135)+(-516679.92))/(22-135+171)
    2000=(18199.69+x+((18199.69+x)/22))*((-135)+35287.25)/(22-135+171)
    1.56=(50.24+(-156.19)+X+((50.24+(-156.19)+X)/(14+134)*(-254))+25.77)/(14+134+(-254)+58)
    2000=(18199.69+x+((18199.69+x)/(22))*(-135-516679.92)/(22-135+58)
    2000=(18199.69+x+((18199.69+x)/(22))*(-135)-516679.92)/(22-135+58)
    8sinx-9cosx=1
    x=140-9/2x
    x^4-2x^3-27x^2-44x+7=0
    [x+sqrt(2)x]^2+x^2=8
    x/4+2x/5=1.3
    (x+3)^2(x+5)^2=9999
    (-2x+800)×(x-200)=20000
    sinx=sin5x

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