book Maths Puzzle Numerical Ability

HOW WOULD YOU SIMPLIFY THIS EXPRESSION AND WHAT IS THE THINKING IN DOING SO ?


8A + B - 2A - 4B

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a teacher has a set of 12 problems to use on a math exam. The teacher makes different versions of the exam by putting 10 questions on each exam. How many different exams can the teacher make? I am a mom trying to help my child heres what we have.
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