4×(x+2)=x-1
    4×(x-1)=x+2
    4×x- 1=x+2
    √t-5÷2=1/-√t
    X^2+X=6
    t-4=√(t-2)
    X-3=2√(X-3)
    2X-√(2X+1)=5
    x-x*6.5%-x*2.29%=284671.65
    x-x*6.5%=284671.65
    x-6.5x=284671.65
    X-X/1.03*0.03=980000
    X/1.03*0.03=980000
    x ^ 2 －8 1 x + 243 = 0
    0.9x+0.95（6000-x）＝5640
    x-x*5.3%-324000=0
    x-5.3%-324000=0
    x-5.3%=324000
    X=4000*1.3*1.2*（1-0.41）+100
    X=4000*1.3*1.2*（1-（1500/（2000-1500+693)）+100

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