djbossbmp19 djbossbmp19
  • 19-09-2017
  • Mathematics
contestada

20-(3x-9)-2=-(-11x+1)

Respuesta :

tropicaia
tropicaia tropicaia
  • 19-09-2017
Answer: x = 2

Explanation
20 - (3x - 9) - 2 = -(-11x + 1)
20 - (3x - 9) - 2 = 11x - 1
20 - 3x + 9 - 2 = 11x - 1
20 - 2 - 3x + 9 = 11x - 1
18 - 3x + 9 = 11x - 1
+ 1                      + 1
19 - 3x + 9 = 11x 
19 + 9 - 3x = 11x 
28 - 3x = 11x 
     + 3x   + 3x
28 = 14x 
÷ 14  ÷14
2 = x 


Check:
20 - (3(2) - 9) - 2 = -(-11(2) + 1)
20 - (6 - 9) - 2 = -(-22 + 1)
20 - (-3) - 2 = -(-21)
20 + 3 - 2 = 21
23 - 2 = 21
21 = 21  yes
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