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Question

Find x :
9x+72(xx27)=36

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Solution

9x+72(xx27)=36

9x+72(7xx+2)7=36

9x+72(6x+2)7=36

63x+49(12x+4)14=36

63x12x+494=36×14

51x+45=36×14=504

x=5044551=45951=9

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