2x-26=x+29
    2（x-13）=x+16+13
    -2*x^2-x+2=0
    -2x^2-x+2=0
    （60-x）*（120+10x）=1800
    6＝-1/k+（16+1/k）e-2k
    6＝-1/k+（1）
    (4798.352+75155.52+41842x+344.922x+373.6x+206.9496x)*0.7= 345741+2838712.5+4123.4x+298951.05+1067660.39
    x*99.975%-120.254*100.025%=0.5/10
    x*99.975%-120.254*100.025%=1/10
     i+8%/9%-8%=5-4.6610/5.6044-4.6610
    x*99.975%-120.341*100.025%=0.5/10
    x*99.975%-120.341*100.025%=1/10
    12.11c=（3.3+c）×7.97
    12.11c=（3.3+c）×7.98
    12.11c=（3.2+c）×7.97
    (1/4x+7/10x+1)-(x+2)=2
    X*60+X*154.8+X*113.36=87398.8794941333
    50x×90%=40x+800
    X*500=30+(600+15)*500

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