（42.309+x）×1.45＝75.418-x+42.309
    0.77*1.1*x=1.9
    1.21*1.1*x=3.61
    35x²-768x+1792＝0
    35x²-768x+1792＝0
    80+x=575-450+x*25%
    x*0.8-(400-100-57)+((25.4-0.2030×12-0.28×12)-(1.6+4)+3-7.65)*37＝2
    x*0.8-(400-100-57)+((20-0.2030×12-0.28×12)-(1.6+4)+x*0.8*0.023+1.5-7.65)*37＝2
    x*0.8-(400-100-57)+((10-0.2030×12-0.28×12)-(1.6+4)+x*0.8*0.023+1.2-7.65)*37＝2
    x*0.8-(400-100-57)+((10-0.2030×12-0.28×12)-(1.6+4)+x*0.8*0.023+1.2-7.65)*37＝2
    x*0.8-(400-100-57)+((10-0.2030×12-0.28×12)-(1.6+4)+x*0.8*0.023+3-7.65)*37＝2
    x*0.8-(400-100-57)+((25.4-0.2030×12-0.28×12)-(1.6+4)+x*0.8*0.023+3-7.65)*37＝2
    x*0.8-(400-100-57)+((20-0.2030×12-0.28×12)-(1.6+4)+x*0.8*0.023+1.2-7.65)*37＝2
    x*0.8-300+57+((10-0.2030×12-0.28×12)-(1.6+4)+x*0.8*0.023+1.2-7.65)*37＝2
    x*0.8-300+57+((10-0.2030×12-0.28×12)-(1.6+4)+x*0.8*0.023-7.65)*37＝2
    x*0.8-300+((10-0.2030×12-0.28×12)-(1.6+4)+x*0.8*0.023-7.65)*37＝2
    x*0.8-400+((25.4-0.2030×12-0.28×12)-(1.6+4)+3-7.65)*37＝0
    x*0.8-400+((25.4-0.2030×12-0.28×12)-(1.6+4)+3-7.65)*37＝2
    x*0.8-400+((25.4-0.2030×12-0.28×12)-(1.6+4)+x*0.8*0.023-7.65)*37＝2
    x*0.8-400+((10-0.2030×12-0.28×12)-(1.6+4)+x*0.8*0.023-7.65)*37＝2

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