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    1-1/(1+1.5%)^N/1.5%=50
    8^17(mod 77)
    (41.183+x)×1.75=41.183+75.166-x
    (41.183+x)×1.75=41.183+76.166-x
    8^17 (mod77)
    8x=-16x+56
    x-x*0.24=1000
    100*22+100*20.4+x*82=25
    100*22+100*20.4+x*82=(200* x)*25
    100*22+100*20.4+x*82=(200 x)*25
    100*22+100*20.4+x*82=(100+ x)*25
    (X-500)*(1-25%)/400=(X-500)*(1-25%)-850*12%/300
    (x-500)*0.75/400=(x-500)*0.75-102/300
    x+lnx=0
    100*10+10*58.7+x*82=(100+ x)*25
    100*10+x*58.7=(100+ x)*25
    1*x=6.71
    1*x=6.71
    a²-2a-2=0
    x=0.869÷(0.853+0.17÷x)

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