4*x-0.5*2*x^2=3.5
    4x-0.5*2*x^2=4
    3(3x-7)-4(x-8)=1
    1/16*x^2+0.8x-41=0
    x^3-2x^2-7x+10=0
    x^3-2x^2-7x+22=0
    (3x-7)/4-(x-8)/3=1
    3x-7/4-x-8/3=1
    2(5y-7)+6=3(2y-1)
    2x-4(x-5)=3-5x
    x^2-28*x+100=0
    x+(x*0.2)=710
    x(x+1/3)=8/3
    x+(x*0.2)=680
    X^2-11.7X+34=0
    （x*0.05）/(1-x*0.05)=0.1
    (x*10^9)/((6.25-x)*(12.5-x))=10^7
    (x*10^9)/((25-x)*(12.5-x))=1.83*10^6
    (x*10^9)/((25-x)*(50-x))=1.83*10^6
    (x*10^9)/((100-x)*(50-x))=1.83*10^6

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