7x^2-28x+1=0
    sqrt((6800+x)^2+x^2)-(6800+x)=52.1
    sqrt((6800+x)^2+x^)-(6800+x)=52.1
    10X-X=32.13
    5x6
    -0.5x²＋36x－650＝0
    x²－72x＋1280
    -11/3+x＝(2+16/9-x)*(2+16/9-x)-4*(2+16/9-x)+3
    -11/3+x＝(16/9-x)*(16/9-x)-4*(16/9-x)+3
    -0.13*x+0.45*x=39000
    （20-x）（99+10x）=1980
    -0.1*x+0.45*x=39000
    2a^2-[2-2^(1/2)]a+5/2{[a^2-2a+3][a^2-a^(1/2)]+2}=2^(1/2)
    18x+1.5x^2＝96
    x∧4+x∧3-3(x∧2)-2x+1
    5x²+108x=3645
    x^2 - 11.5 x+ 32.8=0
    x^2 - 12.7 x + 36.9 = 0
    -0.018*x+0.45*x=58000
    0.018*x-0.45*x=58000

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