20(30+t)/60=40t/80
    (0.75x+1)^2+(0.75x-3)^2=10
    66÷（92+x）=0.618
    x^2-3=1
    30+t/3=t/2
    8x∧2+x-1＝0
    4x∧2+x-1＝0
    297/420=50/x
    3（3x/2）/2=26
    3（3x/2）/2
    3x/2=26
    x-9=18
    （360-x）/（360*1.1-x）=610/1235
    (2x-1)/(3x+4) = 60%
    2x-1/3x+4=60%
    (2x-400)-(x+100)=X-500
    6.9x-390=（6x-600)*(1+20%)
    -0.3x=-630
     835x = 761.71 890x = 874.78
    a×0.6=229

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