Question 841129
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Hi,
The Idea is to <u>Isolate</u> 'a' on one side of the Equation
5(3-7a)=-230   |Distributing the 5
15-35a = -230   |Add 35a to both sides
 15 = -230 + 35a   |add 230 to both sides
 245 = 35a    |Divide both sides by 35
   7 = a