exam Maths Puzzle Numerical Ability

x-[3x-2(9-x)-x} < x-(5-x)

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exam Other Question

I have 7 - 3y = 9x and I have to find the slope
I got 21/7 is that right?

Thanks! Add and Subtract the following polynomials:
1. (-7x^2 + 5xy - 2y^2) + (3x^2 - 5xy - 4y^2)
2. (6r^3 - 8rs + 4s^2) - (-5r^3 + 3rs + s^2)
3. (7a^4 + 8ab + b^2) + (-5a^4 - 8ab - 4