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    490.9×20=
    80-10x+6x-9=5x-15-4
    1.25×1.1×1312.1=
    5(16-2x)+3(2x-3)=5(x-3)-4
    (2*x/9.81)^0.5+x/343=3.38
    -605094534/(1+x)-152968597 /(1+x)^2+453942868/(1+x)^3+606727863 /(1+x)^4+149613636/(1+x)^4.5
    2x^2 - 5x + 4
    2x^ - 5x + 4
    1=-2.4e-11*x^3+4e-7*x^2-0.0024*x+5.6
    x=12.9*3*0.85-(80-33.49)*(38.7/510.85)
    {(50-1.7x)}/2.8+1.7x=50
    x= 61.75*4*0.85-(80-33.49)*(247/510.85)
    x= 12.9*3*1.091*0.85-(80-33.49)*(38.7/510.85)
    x= 61.75*4*1.091*0.85-(80-33.49)*(247/510.85)
    x= 75.05*3-100-30-(80-33.49)*(225.12/510.85)
    x= 75.05*3-100-30-80*225.12/510.85
    x= 75.05*3-100-30-80*(225.12/510.85)
    x= 75.05*3-100-30-80*(225.12➗510.85)
    0.272*0.81+0.288*1.26+1.41x=1
    -9387.75*(1-y)*0.8929+(12664.63-1346.26-14081.63*(1-y))*0.7972+(22769.32-2423.25)*0.7118+(15197.55-1615.5)*0.6355=0

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