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    1-25%x=0.4
    4.5/x-4.5/(50+x)=0.3
    86.4+28+64+(17-x)*4.3=(50+6.5x)/1.5
    86.4%+28%+64%+(17-x)*4.3=(0+6.5x)/1.5
    86.4%+28%+64%+(20-x)*4.3=(0+6.5x)/1.5
    x+(4x-40)+2x=664
    (1.2x)*1/2-x*1/2=2
    x^2+4x-3=0
    571*n^344=10000
    X*1.5%=4874107
    x*sinx
    (20+x)(20+x)+(20+x)=240
    x²+21x-130=0
    x²+41x-180=0
    -10x²+800x=94800
    -X^2+52X
    -x²+200x=9984
    x²-140x-2916=0
    1000/(1+i)^2+3000/(1+i)^3+4000/(1+i)^4 = 3000
    x²²-140x-2916=0

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