4n - 7n = 21
(4-7) n =21
-3n = 21
divide both sides by -3
n = -7
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As follows:- 4n+13 = n-8 4n-n = -8-13 3n = -21 n = -7
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
4n - 2n = 84 2n = 84 n = 42
4n/7 + 8 = 20 subtract 8 from each side: 4n/7 = 12 multiply each side by 7: 4n = 84 n = 21
5n-2+2=4n 5n=4n n=0