arctanx+arctan2x = π/2
    arctanx+arctan2x = 90
    1200*sin（x）+905*cos（x）=1064
    1200*sin（x）+905*cos（x）=1080.2
    0.8 X(x+40)=x+24
    arctan（0.2w）-arctan（0.005w）+arctan（0.025w）-arctan（0.001w）=（π/2）
    22/30+x/45=1
    1/6+(1/6+1/9)x=1
    105x-65x=400
    arctan0.2w-arctan0.005w+arctan0.025w-arctan0.001w=π/2
    2x=1/2x
    arctan0.2w-arctan0.005w+arctan0.025w-arctan0.001w=π/2
    x=1/2x
    30%x＝20%(x＋10)
    x*44%=66
    30x＋70(120－x)＝6 800
    x2+4x+2
    x^5−15x^4+85x^3−225x^2+274x−121=0
    25x＋45(1200－x)＝40000
    x+x*6%=372286.98

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