7-3/2x=1-2/3x
    (360-x)/(360*1.1-x)
    -33x²+231x-393=0
    sin（x+270）=1
    36+x=89
    x（30-3x）=63
    4x^2-134x+1026＝0
    6x^2+7x-2
    3=-2×2/3+b
    x^2-40x+396=0
    4200=（15-x）（400+4x）
    x^3+4x^2+7x+16 = 0
    3/(√(3+x^2)*2*√(1+3/4/x^2))=√7/7
    x^3+4x^2+7x+8 = 0
    x^3+4x^2+7x+2.4 = 0
    x^3+4x^2+7x+400 = 0
    x^3+4x^2+7x＝0
    4181.4646469t^6-0.272t^2-0.15790=0
    x²-2x-2024=0
    x²-2x-224=0

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