cos（x）=1.4/1.5
    x²/x+1
    5（x-7）=2.5
    0.03x^2－2.06x+28＝0
    0.3x＋20÷3x＝0.95
    （2x+1）÷2=6x-2
    (x-3)/10=4x
    x-3
    -4082750+3000000+X-X*10%/4-450000=300000
    1687300-X-41000-450000=300000
    3-2x=2.4
    5*（3-2x）=12
    7x➗3=8.19
    7x^3=8.19
    8x-4*14=0
    18+5x =21
    5x-39=56
    4x-2=10
    x²＋56x－180＝0
    x^2/(x-1)

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