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    140.75a-7a^2+2437.5=480
    x+1/2-2-3x/6=1
    10x^2-2x+0.2=5
    x3-2x2+21x-18=0
    -2x²+1
    (5^1/2:2-x)^2=1-x^2
    (2/3-x)^2=1-x^2
    sinx+cosx=2/3
    18x^2-12x-10=0
    x^2=25
    2x=3
    18x^2-12x-5=0
    x^3-2x^2+4x-16=0
    4x∧2-2x+1
    sinx+cosx=2/3
    10x+x∧2=5.2
    3(x+5)=15
    37.5×a×0.6=15.8
    37.5×a×0.6=15.6
    37.8×a×0.6=15.6

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