keisha12341
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  • 27-10-2016
  • Mathematics
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solve 4(5-a) - 2.1(6a)= -4.9

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Аноним Аноним
  • 27-10-2016
4(5-a) - 2.1(6a)= -4.9
20 -4a - 12.6a = -4.9
20 -16.6a = -4.9
subtract 20 to both sides
20 -16.6a -20 = -4.9 -20
-16.6a = -24.9
divide both sides by -16.6
-16.6a/-16.6 = -24.9/-16.6
simplify
a = 1.5
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