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3n + 4 = 7(- 4 from both sides)3n = 3(divide both sides by 3)n = 1
-n + 4(n + 1) = 3n+4
-3n+5n+4 = -4 2n = -4-4 2n = -8 n = -4
10n+2
3n2-8n+4 = (3n-2)(n-2) when factored