10000/70(x+60)+(150-10000/70)x = 26000
    10000/70(x+60)+(150-10000/70)x = 36000
    1/2ln(1+e∧2x)
    3Q²－8Q＋100=135
    x²-800x+145600=0
    -8/9x^2-4x-4=0
    2(x+1)+(x-2)/3=7x/2-1
    (1+2x)/3+(x-2)=x-1
    n^2＋58n－2400＝0
    1+(x-3)/3=(3x+2)/4
    2x/3-(2x+1)/6=1
    2-X/3=(4x-1)/2
    (1+2X)/3=X-1
    7-3/2x=1-2/3x
    (360-x)/(360*1.1-x)
    -33x²+231x-393=0
    sin（x+270）=1
    36+x=89
    x（30-3x）=63
    4x^2-134x+1026＝0

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