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    180=80+6y
    240-4x=40+16x
    180=3x+(5x-20)
    x*x*2*5=4470
    -11x≤11
    x^3+5x^2-6x+5=0
    x*x*2*4.5=4470
    250X=3500+75X
    2X-1/3-5X+1/2≤1
    sin−1 x = cos−13/5
    (2X-1÷3)-(5X+1÷2)≤1
    220X+(130*0.7-X)*150+65*87+87*0.25*75=22696
    (2X-1÷3)-(5X+1÷2)≤6
    2X-1÷3-5X+1÷2≤6
    4a(a-1)=1
    220X+(130*0.6-X)*150+65*87+87*0.25*75=22696
    -10977(1+x)^(-1)=0
    3(1-X)>2(X+9)
    0.1351506=x(3.68-x)
    2X+3lnX(x-1)=4

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