From what number should you subtract -15/-18 To obtain -3/6
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let Number should be subtracted =x
x-(-15/-18)= -3/6
18x-15/18=-3/6
-54=72x-90
x=3
x-(-15/-18)= -3/6
18x-15/18=-3/6
-54=72x-90
x=3
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