x=91×(6.0-0.45)/4-41.1×(6.1-2.34)^2/6
    x*x*x -5*x*x + 10*x -80 = 0
    9.6*cosx-4*sinx+4=5.76
    x=(4249.61×8.58+689.8×2.63-91×19.59-940.49×14.09-1445.64×9.69)/(16.252+3.94-13.5)
    (300-x/0.601)^2+x^2=90^2
    8*cosx-4*sinx+4=4
    7a=91
    x=(2984.96×6.71+353.96×1.88-91×16.22-940.49×10.72)/(14+2.82-10.5)
    4（t+9)=140
    4.8*cosx-4*sinx+4=1.44
    sqrt17
    x=(1645.4×4.23+79.76×0.89-91×11.74)/(11+1.34-6.0)
    x=(96.93×4×1.42)/(6.5-0.45)
    4.8*cosx-4sinx+20=1.44
    x^(2)+x＝1
    x=(96.93×8×1.42)/(6.5-0.45)
    2x*x+21x-176=0
    x=(99.26×8×1.42)/(6.5-0.45)
    x+40 = 1.5x
    (a-1.75)/3=1.75

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