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    3=x*cos(x)
    128x∧2+254x+128=608
    128(1+x)∧2=608
    128(1+x)(1+x)=608
    x^4+x^2-100=0
    4x^2-4x^4-0.15849=0
    2^(x-5)=x
    25.7116*X*X-55856.68*X+22810516
    (x-30)[600-(x-40)×20]=10000
    (x-30)[200-(x-40)×20]=10000
    44-22x^2-1.5x=0
    (40+x-30)(200-20x)=10000
    x^4+8.602x^2-64.8025=0
    45x^2+1.5x-90=0
    x^2+17.64x-81=0
    x÷2-5=0.3x
    10X∧2-10X+1=0
    x×x÷2×2=32
    (26-x/2)x=80
    x(16-2x)=16

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