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    3000÷x-15=3000÷(1.25x)
    3000÷x-15=3000÷1.25x
    3000/x×1.2=2700/(35-x)
    128+128(x+1)+128(x+1)^2=608
    350(1+x)^2 =504
    350(1+x)^2=499.5
    2(x+1)+2(x+1)^2=7.5
    2+2(x+1)+2(x+1)^2=7.5
    2+2(x+1)+2(x+1)^2
    x-0.18x=1120000
    169x^2+225-360x=625
    x^2-36x+348=0
    (m-(-m^2-3m))^2+((1/2)m-2-((1/2)m^2-(3/2)m-2))^2=20
    3x^2 + 2x - 5
    x^2-25x+100/17=0
    (1/630)*12=x
    (1/3)*(1/6)*(1/35)=x
    (1/3)*(1/6)*(35/1)=x
    2x^2-12 √2x+32=0
    (x-100)(-x+180)=1600

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