2^x=x
    5/6= x ^ ( 0.06 )
    5/6= x ^ ( 0.06 )
    （31－25）x+（36－28）（100－x）=720
    93.6x*20-6.4x*30=16800
    (X+1)^2+(4x)^2=(4x+1)^2
    x÷6+2=x÷4-2
    x÷6+2=x÷4-2
    254119.66-(254119.66/1.09*0.09-X/1.03*0.03)*1.12-(254119.66/1.09-x/1.03)*0.25=x
    2x^2-4√5x+4=0
    (x+3)/0.5+[(1/3)*(x+4)]/0.125-5*x=19
    x+3=6
    x÷6+2=x÷4-2
    (145.5+375.5)/31*x+146/31*(x+15)+93/31(x+30)=1410
    x＝3
    93.6x*20-6.4x*30=16800
    （x+2）x13-4=Xx15+2
    （x+2）x13-4=Xx15+2
    0.17=0.137*a^-3+0.119*a-2+0.269*a-1-0.019
    0.17=0.137a^-3+0.119^-2+0.269a^-1-0.019

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