100*x*222.64/(x*222.64+(1-x)*0.5*335.17)=93.388
    z=2^75241514011443544555555555032016343400361160035
    z=cos60*2^75241514011443544555555555032016343400361160035+sin30
    x=3+9*5*5+3-56+-856+5362+256+52656+4529*85+9589*569+98
    x=3
    200/100=x-10%/15%-x
    3-（3a-3）/2=0
    2x-5=1
    （2m-3）/5=（2/3）m-3
    （4x+2）/6-（10x+1）/6=1
    （2x+1）/3*6-（10x+1）/6*6=1
    25x/10x-2*(x/10)=18/10
    25x/10x-2*(x/10)
    -x/12+9/12=1
    58x/35-62/35=2
    （0.3x+0.5）/0.2=（2x-1）/3
    480+0.75*（x-600)=531
    0.054*x+0.0828(2000-x)=122.4
    0.8x+1.3x=1.68
    0.8x+1.3=3.7

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