Mathematics
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    7x-(5x+5)=6x-5+5
    x^3+2x^2+x
    6(3x+5)=7x-1
    6(3x+5)=7x-11
    6(3x+5)=7x-11
    187:0.97=300:x
    0.97:187=x:300
    (a+1)×(a+2)
    (6-x)^2+2^2=x^2
    x^x=x
    1^x=1
    e^y*lny
    e^y*lny
    (50x+36x)*2=2220
    (50x+36x)*2=2220
    (x-150)*1.5
    X-285=1980-x+285+24
    (x-150)*1.5
    x-150*1.5
    1.98x-1.5x=660

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