x²+1=0
    x+680x/2080＝23
    9x^2-160x-36=0
    -x²-7X+60/4x²+60x
    1/x+1/x+15=1/4
    xlnx/x^2-1
    X -2÷ X
    X^2＋6X＝17×17
    X
    (18-x)*(300+30*x)=5850
    (18-x)*(300+3*x)=5850
    6000*(1+x)^2=7260
    0.4-[(1+x)/x*0.035=0
    x*((72-x)/2)=650
    x*((72-x)/2)=640
    4x+6(x-3)=62
    3q²+8q+100=135
    (232-x)*(80-4*x)+(192+x)*(4*x+8)=17280
    3q2+8q+100=135
    (232-x)*(80-4*x)+(192+x)*(4*x+8)=17280

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