(P-700)*20000-400000 = 400000-P*20000
    (P-700)*20000=400000-P*20000
    x∧2+1.95x=0.259375
    [(40982.02+a+843+8000)-30000-4215]*3% =353.01+a
    P*20000-400000=(P-700)*20000
    P*20000-400000=(P-700)*20000-3000000
    （x+1）*（14-2x）=25
    （x+1）*（14-2x）=25
    2*s^3+12*s^2+18*s+6=0
    2*s^3+13*s^2+18*s+6=0
    -2x²+2x+1
    1280=2x+1039+2496/4x
    1280=2x+1039+2496^4x
    1280=2x+1039+2496*4x
    1280=2x+1039+6231
    cos(4*x)+(sin(3*x))^2=1
    1/x+1/(x+1)+1/(x+2)=1/(x+3)
    4*x^3+18*x^2+22*x+6=0
    1280=2x+909+76336
    76336*4x

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