2(21+2x)(15+x)+2x=875
    -10x²-100x-240=0
    -10x²-100x+240=0
    -10x²+100x+240=0
    x²+67/2x-115/2=0
    33.62×a×0.6=10.9
    -10x²+100x+2000=2240
    2（21+x）（15+2x）+15+2x=875
    2sin2x+2tan2xsin（x-45）+2sin（x+45）-2sin2x=0.5tan2x
    2sin2x+2tan2xsin（x-π/4）+2sin（x+π/4）-2sin2x=0.5tan2x
    9^（x+1）+3^（x+1）-12＝0
    9^（x+1）+3^（x+1）12＝0
    4^（x+2）-32＝0
    √（x-6）-√（2x-3）＝3
    36xx-109x+87＝0
    1.3x-x=150
    y=2/3sin(1 1/2x-π/4
    √（x²-3x）＝2
    1/4x+90+9/20x=x
    1/4x+90+9/20x

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