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3n-11 = 19 3n = 19+11 3n = 30 Divide both sides of the equation by 3 to find the value of n: n = 10
3n+20=170 subtract 20 3n=150 divide by 3 n=50
A - B = -3n + 2 - (5n - 7) = -3n + 2 - 5n + 7 = 9 - 8n
n = 14/3
73n-6+6=15+63n=213n/3=21/3n=7