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Question

How much is x − 2y + 3z greater than 3x + 5y − 7?


Solution

Required expression  = (x - 2y + 3z) - (3x + 5y - 7)
                                   =  x - 2y + 3z - 3x - 5y + 7
Collecting positive and negative like terms together, we get
x - 3x - 2y - 5y + 3z + 7
= - 2x - 7y + 3z + 7

Mathematics
RD Sharma (2014)
Standard VII

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