A - B = -3n + 2 - (5n - 7) = -3n + 2 - 5n + 7 = 9 - 8n
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3n+8=a To find the value of n, you need to know the value of a.
It is an expression that can be simplified to: 3-21n
3n + 6 = n + 202n = 14n = 7
3 + 3n = 9 + 2n + 4n n = -2
It is 12n2 + 3n - 58