If the mean of 2x,5,3x,12,5x,17,6 is 20, then x=________.
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(2x+5+3x+12+5x+17+6)÷7=20
10x+40=140
10x=100
x=10.
Therefore the value of x=10
10x+40=140
10x=100
x=10.
Therefore the value of x=10
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