(108+x)÷(200+x)=0.6
    x^2+4.5x+10=0
    100x^2+20x-19=0
    x^4-34x^2-300=0
    x^4-70x^2+3=0
    x^4-12x^3-70x^2+101x+3=0
    3x^4+36x^3+178x^2+420x+300=0
    9y^2-24y+16＝0
    1/3+（lg2）/3=lgx
    9x^5+15x^4+6x^3-8x^2-6x-1=0
    -2133+170x=x/25.32
    (（1+5^（1/2））/2)^cosx
    (72932-1.1x)*10.2/23*0.9=8.5x
    25=0.0625x^6+1.0625x^4+x^2
    x(x-2)=4
    3(x+4)=4(x+1)
    （X+24）÷0.875+24=1.5x
    x∧2+x∧4
    N*(N+1)=210
    12x-5（x-3）=50

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