7-3（x-2）=x
    x+x÷11.3+225+259=135000
    x+x÷11.3+225+259=13.5
    6x^2+7x-4=0
    6x^2+5x-8=0
    (x-100)^(1/2) +(x+102)^(1/2) = 2* (x)^(1/2)
    30（x-200）=（20+30）x
    30（x-200）=50x
    30x=6050x
    7a^6-54a^5+105a^4-126a^3+105a^2-36a+7=0
    √（8-2y²）
    7a^6-54a^5+105a^4-126a^3+105a^2-36a+7=0
    a^6+3a^5+15a^4+7a^3+15a^2+2a-49=0
    22.7 x=1880
    27.7 x=1880
    n^（n^4）＝64
    x∧-1/2
    90-（arctana+arctan2a）=4
    arctana+arctan2a=86
    （x-2）/2017+（x）/2018+（x+2）/2019=6

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