0.77x=100733
    0.77x=100733
    0.77x=302199
    0.77x=11716
    0.77x=11716
    1/1+x^2
    3s^2+10s+4=0
    -3s^2-10s+1.7=0
    3xx-2x-1=0
    cosx+sinx-1=0
    30x + 17 × 1050 =35x - 18 × 1050
    0.77x=40237
    （a+1）（a-3）=5
    30x + 17 × 1050 = 35x - 18 × 1050
    （a+1）（a-3）=5
    30x + 17 × 1050 = 35x - 18 × 1050
    （a+1）（a-3）=5
    30x + 17 × 1050 = 35x - 18 × 1050
    30x + 17 × 1050 = 35x - 18 × 1050
    30x + 17 × 1050 = 35x - 18 × 1050

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