100*x-5*x-20*x-400=0
    0=1200*x-0.180*x-800*x-2200
    3.35=-lgx
    13.08c=（3.3+c）×7.9
    13.08c=（3.3+c）×7.91
    13.08c=（3.3+c）×7.92
    （9*5）x÷2=69
    -37.46*x^(1/3)=5.8-x
    1/（x+2）
    1/6x+1/12x+1/7x+5+1/2x+4=x
    4x^2=9+x^2
    i(1+i)^10/((1+i)^10-1)=5
    2.5x^3+323.7x-872.4=0
    x-(x-800)*20%=4800
    0.12706/x＝0.1289/0.86289
    0.12706/x＝0.1289/0.86289
    0.4/100.58＝x/31.95
    0.4/100.58＝x/31.95
    (25.343+x)×2.65＝50.687+69.08-x
    (25.343+x)×2.65＝50.687+69.08-x

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