If the arithmetic mean of 5, 4, x, x + 3, 9 and 8 is 6, find out value of x.
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5+4+x+x+3+9+8/6=6
29+2x/6=6
29+2x=6×6
29+2x=36
2x=36-29
2x=7
x=7/2
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