x*0.13+x=210000
    85000/{50000*(1+20%)^n} =1
    85000/{50000*(1+20%)^n}
    (100/115)*x-(10/12)*(x-4)/(100/115)*x=0.05
    1400=（160+x)x4
    10²-x²=(26-x)²
    （x-22)(1520-40x+160)=0
    x*x-x-1=0
    （1520-40*x+160）*x-22*x-3640 = 0
    43*(X÷100)=31
    1599-28x=1725-42x
    （40x-1520+160）*x-22*x-3640=0
    x/(x+21)=0.8
    1-4x²
    x/(x+21)=0.8
    629-90x+216=92-21x-282
    0.02cosx+sinx=0.096
    0.02cosx+sinx=0.086
    0.01cosx+sinx=0.086
    0.05cosx+sinx=0.086

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