x/7.7=0.023
    x/4.56=0.036
    x/4.56=0.079
    x/5=0.031
    （1+x∧2）/x
    26+x² = 30
    26+x²=30
    782÷（x÷2）=391
    150000=27+18*x
    150000=27*x+18
    150000=27*x+18
    150000=19*3000+27*x
    4x^3-18x^2+27=0
    2x-3/x
    -arctan（0.1475x）-arctan（0.0731x）＝-100
    -arctan（0.1475x）-arctan（0.0731x）＝-130
    -arctan（0.1475x）-arctan（0.0731x）＝-140
    -arctan（0.1475x）-arctan（0.0731x）＝-150
    -arctan（0.1475x）-arctan（0.0731x）＝-5π/6
    -arctan（0.1475x）-arctan（0.0731x）＝-7π/9

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