4(x-0.75)=9
    8x+11.2=7.2*5
    18.5x-9.9x=1.72
    9.2x+1.5x=32.1
    9x=16-2.5
    4*(6+x)=28
    2.4x-35=x+35
    0.3(2x+1.3)=6.3
    1.7x+13.4=18*1.5
    54000*(1.03^x)=6000*x
    (x-1)/2-x＝(3-x)/6
    x^2-x-8=0
    50000*0.98^x=1500*1.5^x
    50000*0.98^x=1500*1.5^x
    5x-3.5+6.5=18
    （n^2+n）/2=1378
    （n^2+n）/2=1225
    （n^2+n）/2=1024
    （n^2+n）/2=289
    (y-0.936)/0.936=1.08(y-1)

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