15x+2=9x+20
    sinx=x/7.8
    sinx=x/7.7
    sinx=x/7.6
    sinx=x/7.5
    sinx=x/7
    9.2x+1.5x=32.1
    sinx=x/8
    sinx=x/6
    sinx=x/4
    sinx=x/3
    20/5x=80
    0.8*65+0.8*x+18=102
    45*2+45x=60x
    22x-18x=10.8
    7.2-3x=2.46
    2tanx/1-（tanx）^2=-4(tanx+1)/1-tanx
    2tanx/1-（tanx）^2=-4(tanx+1)/1-tanx
    tan2x
    （4十√5）x2十（2一√5）x一1＝0

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