Math, asked by rkbhandari1308, 5 months ago

If A=5x+11y-15z,B=12x-13y+19z,C=7x-6y+21z,then find:
A-B+C
give answer in step

Answers

Answered by harshitha202034

0

Step-by-step explanation:

$A - B + C \\ (5x + 11y - 15z) - (12x - 13y + 19z) +(7x - 6y + 21z) \\ = 5x + 11y - 15z -( 12x - 13y + 19z )+ 7x - 6y + 21z \\ = 5x + 11y - 15z - 12x + 13y - 19z + 7x - 6y + 21z \\ = 5x - 12x + 7x + 11y + 13y - 6y - 15z - 19z + 21z \\ = \underline{ \underline{18y - 13z}}$

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