(x-3)^2+4x*(x-3)=0
    x^2+3*x-2=0
    x^2-3*x+2=6
    x^2-3x+2=6
    x^2-3x+2=6
    x^2-3x+2=6
    x^2-3x+2=6
    x^2-3x+2=6
    (8-2x)*(6-x)=16
    1.436X+7.937(75-X)=143
    1.436X+7.937(80-X)=143
    x^2-30x+105=0
    1.436X+7.937(75-X)=143
    1.436X+7.937(80-X)=143
    (1+x)∧10+(1+x)∧9+(1+x)∧8+(1+x)∧7+(1+x)∧6＝6
    x∧6
    3681*x^6-3682*x^5+1=0
    x×（x＋2）×（x＋4）＝1000
    5000-（100-2x）（50-2x）＝3600
    1/x+30/15x=1.5

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