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    x^4-2x^3+x^2-12x-5=0
    x+28-(1.25x-28)=6
    x+28-((1+25%)x -28)=6
    4(x+45)=4.5(x-45)
    (n+1)*n=462
    (n+1)*n=231
    (n+1)n=231
    7×1.8-x=6
    2(7y-6)-4y=6
    x+28-((1+25%)x -28)=6
    x+28-((1+25%)-28)=6
    2x*10-8=4*(40-x)
    x+28-(1+25%-28)=6
    x+28-((1+25%)-28)=6
    x^3-35x^2-275x+2125
    20*(0.024^x)-13*(0.052^x)=-7
    X(X-40)=32000
    0.5x+x=37200
    X(X-40)=32000
    X(X+40)=32000

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