Mathematics
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    0.5x+2.7x=2.9
    10x²+2x-1000=0
    (42.309+x)×1.55=72.418-x+42.309
    (42.309+x)×1.75=72.418-x+42.309
    (42.309+x)×1.95=72.418-x+42.309
    (42.309+x)×1.95=73.418-x+42.309
    (42.309+x)×1.55=73.418-x+42.309
    (42.309+x)×1.55=74.418-x+42.309
    x^4-12x^3+28x^2-144x+144=0
    (-2a+100)(a-30) = 150
    (-2a+100)(a-34)=150
    x+1=2
    x^4+4x^3-24x^2+16x+16=0
    x^4-4x^3+6x^2-4=0
    (2000*X)/(10000+480)=100%
    (2000*X)/(10000+480)=140%
    (2000*X)/(10000+480)=160%
    115=20*lgx+0.036*80^(3/2)
    3.5=1.5x+2*log(5,x-9)
    0.88*(4a²+4a(0.03/(a-0.01)²+0.02)

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