book Maths Puzzle Numerical Ability

find the sum or difference indicated for each pair of polynomials
(4x - 6x + 5) + (3x + 14x - 6)

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book Other Question

i am less than 100
The sume of my digits is 4
half of me is an odd number

What number am i?
the square root of 18y+9 =y+5