Tìm x thuộc Z, biết

a, -5/7 + 1 + 30/-7 <_ x <_ -1/6 + 1/3 + 5/6

b, 1/2 - ( 1/3 + 1/4 ) < x < 1/48 - ( 1/16 - 1/6 )

c, ( x - 1/2 ) × ( x +3/4 ) < 0

d, 3/ ( x +2) ×( x +5) + 5/ ( x +5 ) × ( x+ 10) + 7/ ( x +10) ( x +17) = x / ( x+2) × ( x + 17)

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