13 is the result of the sum of negative 8 and negative of 3 times a number
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let the number be x
-8 +(-3x)=13
-8-3x=13
-3x=13+8
-3x=21
x=-7
-8 +(-3x)=13
-8-3x=13
-3x=13+8
-3x=21
x=-7
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