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    15-2x=8.2
    15-2x=8.2
    8*x^3-10x^2-5x+16
    m²+4m√m-4√m=20
    15-2x=8.2
    x^2+40x-40=0
    x÷42+x÷56+x÷72=3
    x÷42+x÷56+x÷72=3
    15-2x=8.2
    15-2x=8.2
    x*lnx-(19.43*x)+42311.86=0
    x+1.25x=90
    x-11.25x=90
    3(x+2.1)=10.5
    3.85+1.5x=6.1
    1000=100/(1+r)+100/(1+r)^2+100/(1+r)^3+100/(1+r)^4+100/(1+r)^5+100/(1+r)^6+100/(1+r)^7+100/(1+r)^8+1000/(1+r)^8
    400(1-x)^2=256
    0.5k^2+2k-8=0
    x^2-x+1=0
    x^2-x+1=x

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