x/(0.067-x)^2=1.75×10^9
    sin(16πx/5+π/4)
    1.0583^x=5.15
    100x²-177x+48=0
    (x-6)(x+1)-8=0
    x+x*0.09=41535
    x^2-8.7x+15.5=0
    (149+120+225)/30*x+120/30*(x+15)+90/30*(x+30)=972
    x^2-820x+72463=0
    x^2-820x+72464=0
     x²+2x-0.088＝0
     x²+2x-0.2725＝0
     x²+2x-27.192＝0
    x²+2x-21.588＝0
    x²+x-20＝0
    0.21 - 0.1[30x - (0.1 + x)] = 0.5x - 0.1[6x - (0.1 - 7x)]
     -17*(x-39)^2*x^4*(x+1)^2/3125000 + (x-39)*x^3*(x+1)/8750 + x^2*(x+1)/625 - 8*(x-1)^2*x^3*(x+1)/31250 + (x-1)*x^2*(x+1)/375 - x^2*(x+1)/625 + x^4*(x+1)/6250
    12x²-14x+3=0
    x^2-10x+40=0
    tanx-x=0.35

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