book Maths Puzzle Numerical Ability

how do i find the x-intercepts for the question 3xsquared plus 5x minus six?

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DIVIDE

1. x^5-x^5y-3x^3y^2-2x^2y^3+2x^2y^4+3x^3y^3-xy^4+xy^5 by x-xy

2. x^5-2x^3+5x by x^3-x

SIMPLIFY

3. a/1/a+2/3a^3/a/3

4. (2/a+3/b)/(2/a-3/b)/(3+2b/a)/(2-3a/b)
Simplify the expression

x-2 x+5
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x^2-9 x+4