Well you have not mentioned the thickness of the board so as a rough idea the weight of 10'x4 pine board with 12 mm thickness is appx. 60 kg. For complete answer you may ask experts at http://www.gharexpert.com Regsasrds
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0, -1/10, 2/10, -3/10, 4/10, -5/10, 6/10, -7/10, 8/10, -9/10, 10/10, -11/10
a + 4 = 10(a + 4) - 4 = 10 - 4a = 6
-4-x = 10 -x = 10+4 -x = 14 x = -14
4(x- 8) + 10 = -10
Answer is 6 here, x - 10 = -4 so, x = -4+10 x = 6