10x=0.9|9
    (1/2)*x-1/2+1/3=4/5
    1.5x=1
    x/60+x-20/40=1
    1/0x=1
    1e2=10^2x
    abc(-1) 0.3|3
    x+1=1
    28=4x+7.8x^2+8x^3
    28=4x+7.8x^2+8x^3
    0.45*50*√19.62*（x-554.08）^1.5+（0.9*2.8965*√（19.62*（x-525）））＝2012
    40x²+72x-26=0
    540/87+240/X-1.6-800/1650-36/44.7=4416*0.0012
    x*x-150*x+4950=0
    x*x-150*x+4950=0
    (2-lnx)÷x
    13000a=29413
    13000a=2578
    13000a=2578
    13000a=2578

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