30x + 17 × 1050 = 35x - 18 × 1050
    30x + 17 × 1050 = 35x - 18 × 1050
    30x + 17 × 1050 = 35x - 18 × 1050
    0.77x=120711
    0.77*a=178429.1
    x（x-6）=8
    （38－2x）×（50－2x）＝1260
    x÷35+17=x÷30-18
    x÷35+17=x÷30-18
    x÷35+17=x÷30-18
    x÷35+17=x÷30-18
    x^2+5x+1=0
    x^2-5x+1=0
    x÷35+17=x÷30-18
    2x=1.6x+0.4x
    3s^2+12s+5=0
    0.8x+0.2x=x
    40=a*3.7906+3.1045
    40=a*3.7906+3.1045
    5X=1000十2000

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