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    x^2+2x-15=0
    (217+371.5)/31*x+151.5/31*(x+15)+124/31(x+30)=1839
    3x-x+3-(4+7)=10
    (3x-x)+3=1
    (3x-x)-3=1
    3x-(x-3)=1
    x+(x×0.0.6)=4646
    (800+x)-2500-(800+x-12168.93)*0.25=10089.96
    (x-4)÷x=√3÷3
    (800+x)-2500-(800+x-12168.93)*0.25=10089.96
    x^3-0.96x+0.256=0
    3q^2-55q-100=0
    (10000÷(104+x))+(20000÷(214+x))+(10000÷(164÷x))=150
    10000÷(104+x)+20000÷(214+x)+10000÷(164÷x)=151
    10000÷(104+x)+20000÷(214+x)+10000÷(164÷x)=150
    x/7*12-x+x/6*4=60
    10000÷(104+x)+20000÷(214+x)+10000÷(164÷x)=150
    (40-x)^0.75=0.39(x-39)
    (40-x)^0.75=0.364(x-39)
    x*x*x-x*x-4*x+12=0

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