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    2a+3=0
    2x+5=6
    1.5x²+14=10x
    1.5x²+14=10x
    0.5x²+14=10x
    10-5(2x-1)=15(x+1)
    10*a-10/a=48
    10*a-10/a=15
    10*a-10/a=10
    12.3c=(3.4+c)×7.93
    12.3c=(3.4+c)×7.92
    12.3c=(3.4+c)×7.92
    12.3c=(3.4+c)×7.92
    2x+2x-1+2x-2+2x-3+2x-4+x=150
    3.5*ln(x-300)+ln(3)=0
    15+(40−x)=1.5×(20+x)
    15+(40−x)=1.5×(20+x)
    8%*x+20%*(1-x)=15%
    (s^2+1)(s+5)=(s+4)((s^2+1)+2s(s+5))
    (s^2+1)(s^2+5)=(s+4)((s^2+1)+2s(s+5))

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