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25 - n = 21
-n = 21 - 25
-n = -4
n = -4/-1
n = 4
b. (42 - 21) x 2 = 8 x n
21 x 2 = 8 x n
42 = 8 x n
42 - 8 = n
34 = n
-n=21-25
-n=-4
n=4
(24)*2=8n
48=8n
n=48/8=6