book Maths Puzzle Numerical Ability

How many sets of three integers are there in which the sum of the three integers does not equal three times the middle integer?

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book Other Question

HOW CAN YOU DETERMINE "LIKE TERMS" IN ALGEBRA, I AM HAVING A HARD TIME. WHAT SHOULD I DO?

8s - 3s + 4k =5s+4k because the like terms are like family members

10x + 6y -5x =15x+6y

12 + 6p + 3q - 5p + 7q =12+11p-4q z^2+z-3