b^2-70b+298=0
    x-482048.1=0.1x/1.05*0.05
    2.4026πx-sin（2πx）-0.16775=0
    2.7614πx-sin（2πx）-0.31725=0
    x-452=156
    1.1269πx-sin（2πx）-0.1586=0
    45868-a=53694147523689
    1.1269πx-sin（360x）-0.1586=0
    300×15=75×5＋10x＋235×15
    1.1269πx-sin（360x）-0.1586=0
    1.1269×3.14x-sin（360x）-0.1586=0
    1.1269πx-sin（360x）-0.1586=0
    1.1269πx-sin（2πx）-0.1586=0
    5＝1+2×d
    2x+3=6
    x-631.2-251-x*0.10 = 0
    x-597.7-188.6-x*0.10 = 0
    y=100+0.8y+100
     x-459-x*0.12 = （ x-459 ）*0.4
    （（500-X）/X）*100=2.5

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