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=> 18x x 9.7/ 159.5+18x = 3.5
=> 174.6x/159.5+18x = 3.5
=>174.6x = 3.5(159.5+18x)
=>174.6x = 558.25 + 63x
=>174.6x -63x = 558.25
=>111.6x = 558.25
=> x = 558.25/111.6
=> x = 5 Ans..
Hope it will help....
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