cosx=-5/13
    x*0.79*1.3=3.87
    √2.6÷60＝x－6
    x*0.55*1.3=3.87
    x*0.79=3.87
    x*0.79=3.87
    x*0.79*2=3.87
    x*0.55*2=3.99
    3000/x-3000/1.5x=5
    7/8*x=11/16
    2.8x-14.4=x+14.4
    3.5x-0.8x=11.34
    5.8x-3.3x=20
    (16-2x)/3=0.4
    7.2-3x=2.46
    3x-1.5x=1.2
    x²+5x+25＝0
    6.35=7x+x^2
    (16x+27)²*(8x+15)*(2x+3)=7
    0.5^-x

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