x²+2x
    0.58*n^18+n^17+n^16+n^15+n^14=5
    6x^2-28x-49=0
    (20+x)(200-4x) = 4800
    (20-x)(200-4x)=4800
    -2*3=x
    x∧2+8x+13=0
    13.8×200x(460-x/2)=145000000
    5×[(1.5x—30)×0.8—x]=( 1.5x—x) +130
    5x [(1.5x—30) x0.8—x]=( 1.5x—x) +130
    X/1+X
    16×n^15+20×n^14+20×n^13+20×n^12+20×n^11=137.6737
    16×n^15+20×n^14+20×n^13+20×n^12+20×n^11=119.9979
    16×n^10+20×n^9+20×n^8+20×n^7+20×n^6=106.4302
    18×n^10+20×n^9+20×n^8=66.5856
    a×0.6=20
    16×n^10+20×n^9+20×n^8+20×n^7+20×n^6 = 1158387
    21968 * (1+x)^11 = 39218
    16*n^10+20*n^9+20*n^8+20*n^7+20*n^6 = 1064302
    a×0.6=10.9

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