n=10/7.
i did this one mentally.
but are you sure its 8n minus negative 4n or is it 8n minus 4n?
8n- -4n does not equal 8n-4n
8n- -4n is the same as 8n+4n
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4n - 2n = 84 2n = 84 n = 42
3n + 2n = 25 5n = 25 n = 5
The value of n is 12.5
Nonsense.
-7 = 2n + 19 Subtract 19 from both side -26 = 2n Divide by 2 on both sides n = -13