book Maths Puzzle Numerical Ability

Divide.
1) -15xy - 10x
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5x

2) 2x2y - 6xy2 + 12xy
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2xy

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book Other Question

X/3 + 1/6 (less than or equal to) 2x + 3/2 Please show me how to work this.
x+5/-1

What values for x must be excluded? The answer is none, but I cant figure it out!