110＝x/2000+50x+0.01
    88X-X^2=1095
    88X-X^2
    1-2/3x-（1-x）^2/3=0.00032*300
    x^2-3x-2
    219.9×11.9=1.2x
    265000000=11.9×250x×(515-x÷2)
    265000000=11.9×250x×(515-x÷2)
    0.1459÷x＝0.1289÷0.8629
    （41.789+x）×1.75＝71.878+41.789-x
    76+x-75-x=82
    -x＾3+7x＾2-12x+2
    0.6*（1+i）/12+i=11%
    x+x*0.01=8815
    x√1+x²＝1
    6000=2500（1+y）^8
    1000 = 1400/(1+y)^5
    1000 = 1400/(1+y)5
    20.7×a×0.65+3=12.38
    11.7×a×0.65+3=8.1

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