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Question
Simplify:
2 (3a − b) − 5 (a − 3b)
Sum
Solution
2 (3a − b) − 5 (a − 3b)
= 6a − 2b − 5b + 15b
= 6a − 5a + 15b − 2b
= a + 13b
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Concept of Substitution
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