0.85*42X+0.15*15X=19283*0.53
    0.85*42X+0.15*15X=14420*0.53
    0.85*42X+0.15*15X=14000*0.53
    (x-1561.69)/x=2.34%
    (3*x^2-2*x-1)/(x-1)=4
    5x-13=1.4×5
    24.25×7.19＋0.23×281＋1.25×0.81
    13.2×0.61＋0.132×11-0.72×0.7
    4.24×1.71+424×0.0552＋72.3×0.576
    4.5×5.2＋0.36×52＋0.81×48
    280×3.29＋32.9×22-89×5
    1.13×81-11.3×1.7＋0.64×12
    3.7×5.2＋0.37×13＋0.065×630
    13.7×5.2＋0.37×13＋0.065×630
    0.68×89-7.9×6.8
    99.8×12.5-980×0.125
    x×7.04％=228
    x×8.59％=167
    x×11.95％=153
    x×66.47％=688

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