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    3x+(30-x)=78
    3x+(30-x)=78
    3x-(30-x)=78
    (12-54.147715x)(1+x/12)^60 = 12
    x*x+x-1
    (12-54.147715x)(1+x/12)^60 = 12
    (X-(8951.88-75))*7.2*1000=1000000
    (12-101.35392525x)(1+x/12)^142 = 12
    (X*1.05-(8951.88-75))*7.2*1000=1000000
    (12-139.277983x)(1+x/12)^240 = 12
    (12-139.277983x)(1+x/12)^240=12
    (12-139.277983i)(1+i/12)^240=12
    (1-139.277983i)(1+i)^240=1
    10000X*0.95=2850000*10000X*0.25
    49x²+36x-36=0
    (x+98)(42-x)(x+98)=25×640×25
    (x+98)(42-x)=25×640
    5×(x-10)²=180
    2x^2+13x+4=0
    2x^3+21x^2+38x-8=0

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