x=5
    12x^3-7x^2-12x-9=0
    x^2-(6/5)*x+3/10=0
    (85%×160)x+6(85%×60)=100+(75%×160)x+(75%×60)6
    10×8+8×70%(x-10)=164
    15*x^2-179*x-60=0
    （1000-140）*10+（1000-220）*（x-10）=800x
    0.26=（（0.021*x^1.85+128）^0.5）*x^0.84
    0.026=（（0.021*x^1.85+128）^0.5）*x^0.84
    1.692=（（0.021*x^1.85+128）^0.5）*x^0.84
    50x+7500=45x+8180
    0.12*20+0.09(x-20)=0.1x
    5*42+(a-5)*42*0.8=36.4a
    30x+40(50-x)=1650
    30-20=300x
    42x+30(50-x)=1650
    10*8+70%(x-10)=164
    X^2＋X=30
     8x+70%(x-10)=164
    90%(30%x+20%(200-x)+200)-200=27.7

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