6000*(1+x)^2=7260
    0.4-[(1+x)/x*0.035=0
    x*((72-x)/2)=650
    x*((72-x)/2)=640
    4x+6(x-3)=62
    3q²+8q+100=135
    (232-x)*(80-4*x)+(192+x)*(4*x+8)=17280
    3q2+8q+100=135
    (232-x)*(80-4*x)+(192+x)*(4*x+8)=17280
    x²-53x=196
    x²-53x=196
    1/2×x×4X=12
    1/2×x×4X=12
    (7+x)x(8-x)＝50
    49.9×a×0.52=18.9
    35.6×a×0.52=13.8
    2x+2x-1+2x-2+2x-3+2x-4+2x-5+2x-6+2x-7+2x-8+2x-9-x＝230
    399+30x=100+109x
    399+30x=100+109x
    x-x/1.09*3% =767837.49

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