zietarafields88S zietarafields88S
  • 25-08-2016
  • Mathematics
contestada

Six times the sum of a number and twelve is forty.

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dalendrk
dalendrk dalendrk
  • 28-08-2016
x-the number

6(x + 12) = 40    |use distributive property: a(b + c) = ab + ac

6x + 72 = 40    |subtract 72 from both sides

6x = -32    |divide both sides by 6

x = -32/6

x = -16/3

x = -5 1/3
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