Dell381 Dell381

17-03-2015
Mathematics

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what is the solution set for 8x-9=11x+12

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baonguyenq1999 baonguyenq1999

17-03-2015

8x-9=11x+12
8x-11x-9=12
-3x-9=12
-3x=12+9
-3x=21
x=21/-3
x=-7

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Panoyin Panoyin

18-03-2015

8x - 9 = 11x + 12
-8x -8x
   -9 = 3x + 12
   -12    -12
   -21 = 3x
   3 3
   -7 = x

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