3n+18 = 39 -4n 3n+4n = 39 -18 7n = 21 n = 3
3n+6=18 n+2=6 n=4
n = 3 3n x 2 = 18 3n x 2 / 2 = 18 / 2 3n = 9 3n / 3 = 9 / 3 n = 3
3n-5=13 +5 +5 3n=18 /3 /3 n=6
s = 9n - 18.
21
3n = 0.138 n = 0.046
8 + 3(6) = 8 + 18 = 26
3n -5 = 19 3n = 19+5 3n = 24 n = 8
18 - 3n + 2 = n + 20 - 4n gather terms together on both sides of equation - 3n + 20 = - 3n + 20 0 = 0 =============no true solution here Actually, it's an infinite number, not "no solution" because it can also be done to end with n=n. I realize you didn't strictly say "no solution" but that's what it sounds like, so I'm just clarifying. -3n+20=-3n+20 -3n=-3n n=n
3n x 3n = 9n if 9n = 36 then n = 36/9 = 4
7