Exercises of Topic 4: Multi-variable linear equations (B)

Art of Problem Solving (AoPS): Introduction to Algebra, Topic 4: Multi-variable linear equations (B), Exercises (Selective)
Before taking the exercises, you can watch the lecture of Topic 4 (A) here: • Topic 4: Multi-variabl...
and Topic 4 (B) here: • Topic 4: Multi-variabl...
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