x+2/7=3/4
    2.5=x/(x-75)
    2.5=x/x-75
    （a×a）+a=600
    4X+（X*0.3）=1540
    4X+（X*0.3）=154
    4X+（X*0.9）=154
    3√x^3
    x+2/x-3
    （X1+X2+X3）(X2*X4)(X1+X5+X6)
    (120-x)(64+1.6x)=8800
    450X-（310.02+240X）-（450X×13%-15X-30.4）×12%=0
    x^3+3x^2+2x+1=0
    10=0.05x+0.005x^2
    12=0.1x+0.01x^2
    （0.525W－180）/130＝（0.525W－186）/80
    （0.525W－180）/130＝（0.525W－186）/80
    x²+6x=48
    arctanx+0.8x=π
    tan0.8x+x=0

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