1/d＋1/(d＋5)+1/(d＋20)＋1/(d＋2.924)=1/(d＋1..36)
    x²-16x-64=0
    0.8×X=7000+X
    x/20+x/30+x/42=3
    15×1.5%x+8/10x=1107
    1/2(6+10)h=50
    0.625*x^2-x=1.25*x-2
    8h=50
    80h=50
    4*3-4*2x=4x+12
    4（3-2X）=4X+12
    7x^3+4x^2+3x+2=0
    21+0.7x＝x
    1/X=330/100
    x^2-10x+25-64/5-x
    x^2-10x+25-64/5-x=0
    arctan(0.5w)＋arctan(w/6)=39
    x^2-6x+8=0
    arctan(0.5w)＋arctan(w/6)=49
    66.26*x➗1608.9=0.0177

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