25+x＝30.2+139.666-x
    32x^4-24x^3+2x=0
    940=（（0.021*x^1.85+2300）^0.5）*x^0.84
    246.75=（（0.021*x^1.85+2300）^0.5）*x^0.84
    30.785=（（0.021*x^1.85+2300）^0.5）*x^0.84
    2.09=（（0.021*x^1.85+2300）^0.5）*x^0.84
    x=49100+6.72%x
    x=49100+6.72%x
    317*（1+X）^3=321
    3-6((1/3)x-2)=2-(5-(1/2)x)
    2x-4(x+1)=5(x+1)-6
    0.2x+0.6(20-x)=8
    7(x-2)=11+3(3x-5)
    x-3(5-3x)=6
    6+2（5x-1）=2x
    x=57000+6.72%x
    1-（3/x）=0.986
    x=136.28+x/1.05*5%
    x=171.562098058556+x/1.05*5%
    x=136.96+13+1+(x/1.09*0.09)*1.12+x/1.09*12%

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