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12+6n=143+n
Use the distributive property to multiply 6 by 2+n.
12+6n-n=143
Subtract n from both sides.
12+5n=143
Combine 6n and -n to get 5n.
5n=143-12
Subtract 12 from both sides.
5n=131
Subtract 12 from 143 to get 131.
n=\frac{131}{5}
Divide both sides by 5.