60+x-(120+60+x/5)=12
    x^2-4x+1=0
    x-(x*13%-0.09)*12%=1
    x-(x*13%-0.09)*12%=1
    x-(x*0.13-0.09)*0.12=1
    9t^2-50t+25=0
    1.2*20/9=x
    4000/x-4000/1.2/x=300
    0.12×20+0.12×0.75(x-20)=0.1x
    0.12×20+0.12×0.75x-15=0.1x
    3^(x+1)5^(x+1)=15^(2x-3)
    4(4-(x^2+(16/5))/(4/5sqrt(5)))=(8/5sqrt(5)-x)2x
    50x^20+50x^19+50x^18 =328.664
    50x^15+50x^14+50x^13 =264.356
    50x^13+50x^11+50x^12=243.153
    50x^10+50x^11+50x^12=233.082
    50x^10+50x^9+50x^11 =223.605
    50x^7+50x^6+50x^5 =177.730
    (x-4)/3-8＝(x+2)/2
    50x^10+50x^9+50x^8=157.450

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